Yes, it is because much pollution is caused by things that benefit people 3) Who can find ways to lessen the amount of pollution??. scientists and engineers.[r]
Trang 1I ADVERB AND ADJECTIVE
Write down the correct form of the word in brackets (adjective or adverb).
1 Tom is (slow) He works _ slowly_
2 Sue is a (careful) girl She climbed up the ladder _ (carefully _
3 The dog is (angry) It barks _ (angrily _
4 He acted (excellently He's an (excellent) actor
5 They learn English (easily They think English is an
_ (easy _language
6 Max is a (good) singer He sings (well
7 It's (awfully cold today The cold wind is _ (awful) _
8 Dogs rely on their noses as they can smell (extremely / good) If that is true, why does dog food smell so ( terrible) ?
9 The little boy looked ( sad) I went over to comfort him and he looked at me
_ sadly _
10 I tasted the soup (carefully but it tasted ( wonderful) .
11 Niagara Falls form a _ natural _ border between the United States and Canada
12 Tourists visit this place ( frequently / frequent)
13 The Falls are very (noisy/ noisily)
14 So you must speak or nobody can understand you (loudly /loud)
15 Many years ago, the Iroquois tribe lived here ( peacefully / peaceful)
16 He is a boy ( clever)
17 He is tired because he hasworked (hard)
18 He isn’t tired because he has worked ( hard)
19 She is a girl ( quiet)
20 She went to bed ( quietly )
21 He is not a good student but he writes ( well)
22 You should speak more (softly)
23 The children behaved (badly)
24 The brave men fought (bravely)
25 They lived together ( happily)
26 She looks ( pretty)
27 That milk tastes (sour)
28 I don’t know where they live ( exactly)
29 She turned (palely)
30 This brown fur feels ( soft)
II Give the correct tense of the verb in bracket
1/ If he (studies harder, he can pass an exam
2/ She may be late if she (doesn’t hurry)
3/ Tell him to ring me if you (see) him
4/ If you are kind to me, I (will be) _ good to you
5/ If he (gives) _ up smoking, as his doctor orders, he will be soon well again
7/ You (won’t pass) your driving test unless you drive more carefully
8/ He’ll be ill if he (doesn’t stop) worrying so much
9/ We’ll go to the beach tomorrow if it ( is) nice
10/ Jane will never( get) there on time if the train leaves soon
11 If I see him I will (give)……… him a lift
12 If he (eats)……… all that he will be ill
13 If I find your passport I (will telephone)……… you at once
14 If he (reads)……… in bad light he will ruin his eyes
15 Someone (will steal)……… your car if you leave it unlocked
open)?
17 If he (washes)……… my car I'll give him Ј10
18 If she (needs)……… a radio she can borrow mine
19 If you (don’t go) ……….away I'll send for the police
20 I'll be very angry if he (makes)……… any more mistakes
21 If he (is) ……….late we'll go without him
22 If you give my dog a bone he will(bury)……… it at once
Trang 223 If you come late they (won’t let) you in.
24 We'll have to move upstairs if the river (rises) any higher
25 If he (works)……… hard today can he have a holiday tomorrow?
26 If you (don’t like)……… this one I'll bring you another
27 She won't open the door unless she (knows) ……….who it is
III Choose the best answer by cycling A, B,C or D: (1m)
1 a dynamite b recycle c environment d littering
5 A stopped B weighed C used D climbed
8 A dormitory B forward C organizationD information
10 A plough B mountain C south D countryside
11 A invite B river C shrine D primary
12 A behave B medal C refine D rewrite
13 A receive B replace C regularly D reduce
15 A bulb B plumber C profitable D label
16 A laughed B missed C wasted D dropped
17 A environment B idea C condition D pesticide
19 A ocean B practice C reduce D force
20 A feature B reason C season D pleasant
II Choose the words that has a different stress pattern from the others.
1 A objection B opinion C official D optional
2 A compulsory B convenient C correspond D communicate
3 A recycle B garbage C prevent D pollution
4 A pesticide B environment C authority D suggestion
5 A complication B deforestation C electricity D disappointed
6 A problem B extremely C mention D natural
7 A treasure B poisonous C resource D plastic
8 A replace B efficiency C electricity D appliance
10 A refrigerator B innovation C population D entertainment
12 A account B conserve C install D faucet
13 A energy B natural C appliance D furniture
14 A category B necessity C ordinary D profitable
15 A quarter B receive C hobby D label
VI Choose the most suitable word or phrase to complete the following sentences
1 She is very tired she has to finish her homework A but B however C and D so
2 I suggest money for the poor people in our neighborhood A saving B to save C save D.saved
3 Who looks your children when you are away from home? A to B for C at D after
4 We learn hard, we hope to pass the exam A but B however C and D so
5 Can you turn the radio? I am learnlg my lesson? A on B for C in D off
6 Unless you understand, I explain it to you A am B was C will D would
7 If he a student, he will get a discount A were B was C is D will be
8 We are talking about the preservation of resources
A nature B natural C naturally D naturalize
9 If we pollute the water , we ….(will have / had / have ) no fresh water to use
10 Mrs Hoa speaks English quiet ……( good / well / better )
11 He broke the cup ( because / so / but ) he was careless
12 If the rice paddies (will be / are / were ) polluted , the rice plants will die
13 I want to go to the cinema with you (because / and / but) I have to help my mother
14 Minh is absent today( because/ or / however) he is sick
15 Mr Long suggests … (got / get / getting) some tool to check cracks in the pipes
16 What about ……( going / to go / go ) to the countryside ?
17 I suggest that you ( should / could / would ) help your mother with her houseworks
Trang 318 It’s raining , ( and / but / so ) I can’t go to the beach.
19 _ his physical handicap, he has become a successful businessman
A Although B Despite C Because of D Because
20 She was absent _ her cold was worse
21 The examination was long _ difficult
22 John was ill, _ he went to bed early
A but B so C because of D however
23 I’d love to play the table tennis _ I have to complete an assignment
24 He likes to travel, _ so does she
35 The new models are expensive, _ efficient
A however B therefore C and D but
26 He failed his examination _; she will have to do the examination again
A However B But C Therefore D Because
27 Students have to carry their duties
28 He ate the chocolate cake _ he is on a diet
A in spite of B because C despite D even though
29 She attended the class she didn’t feel alert
30 Classes will be canceled tomorrow _ it is a national holiday
A therefore B because C but D because of
31 _ her mother’s sickness, she couldn’t attend our wedding
A As of B Because of C Because D Since
32 It can be black, white gray
33 Is it a boy _ a girl?
34 Internet is a very fast convenient way for us to get information
35 He is going to collect all the bags _ take them to the garbage dump
36 He likes her a lot _; he wouldn’t keep calling her
37 Yesterday, he gave his evening job
38 It was still painful, I went to see a doctor
39 In Western countries, electricity, gas, water are not luxuries but necessities
44 The examination tested both listening reading
41 It is raining, I can’t go to the beach
42 If you _ complaining, I’ll leave immediately
43 Go _ until you get to the junction and turn left
44 He took _ my wet boots and made me sit by the fire
45 May I borrow your dictionary? I want to _ this word
46 Lan suggested to the zoo at weekend
47 Shall we clean up the kitchen, Mum ?
A Yes, we do B O.K C No, we don’t D Yes, let’s
48 It ‘s so hot Why don’t we go swimming ?
A Yes, we do B No, we don’t C That’s a good idea D Yes, thanks
49 Let’s go somewhere for a drink
A All right B Yes, we do C No, we don’t D No, thanks
50 This movie is not interesting How about to the concert
Trang 4A to go B going C go D went
51 My classmates suggested playing chess but I prefer hike and seek
52 You don’t like English food What about Chinese food?
A to eat B eat C eating D ate
53 I think we should up our neighborhood
A to clean B clean C cleaning D cleaned
54 Our teacher suggests a meeting to discuss about the solution to keep our environment clean
A to hold B hold C holding D held
55 Her former leader suggests that she should harder to break her past records
A to train B train C training D trained
56 The children volunteer to clean up the local park there are lot of used cans and trash there
A but B because C and D so
57 Her mother took her to the zoo it owed her some rare animals
58 The “Green Sunday” was short: , the students enjoyed it very much
A but B because C however D although
59 Hoa missed the bus this morning, she went to school late
60 Dioxins are dangerous chemicals they can cause cancer and birth defects
A but B however C because D therefore
V Complete the second sentence with the same meaning: (2,0m)
1 Let put garbage bins around the school yard
"I suggest putting garbage bins around the school yard
2 Tom failed the exam because of his lasziness
"Because Tom was lazy, he failed the exam
3 Unless we reduce the use of water and electricity, we will have to pay more this month
"If we we reduce the use of water and electricity, we won’t have to pay more this month
( if we don’t reduce the use of water and electricity, we will have to pay more this
month
4 shall we use gas instead of burning coal?
I suggest using gas instead of burning coal?
………
5 How about reducing the amount of water we use every day?
why don’t we reduce the amount of water we use every day?
………
6 Why don’t you install a burglar alarm in your house?
I suggest………
7 Let’s put garbage bins around the schoolyard
I suggest installing a burglar alarm in your house ………
8 Unless we reduce the use of water and electricity, we’ll have to pay more this month
If………
9 We were disappointed She didn’t keep her promise
……… We were disappointed that she didn’t keep her promise
………
10 I’m sorry I came late
…… I’m sorry that I came late
………
11 The boss was angry I misplaced all the documents
…… The boss was angry that I misplaced all the documents
………
12 I am happy The article has been very well received
… I am happy that The article has been very well received
………
VI Read the passage, then answer the questions: (3pts)
In Britain, natural gas is the most popular fuel for heating homes, and for cooking It is piped all over the country from the gas fields below the North Sea Natural gas is used chiefly as a direct source of energy, although it is also used in the chemical industry At the moment the supply is plentiful, but it will be running short by the end of the century, and will run out during the 21 st unless new supplies are found We could do without natural gas, as coal as gas can be used as a substitute, and there should be enough coal to last for severat centuries However, it is a form of energy which is not only cheap, but also highly efficient
Questions:
1 What is natural gas used for?
Trang 5for heating homes
2 Where does it come from?
from the gas fields below the North Sea
3 What is gas used chiefly as?
It is used chiefly as a direct source of
4 When will it run out?
the 21 st
5 What can be used as a substitute for natural gas?
coal
6 Is natural gas expensive?
No, it isn’t
VII Read the paragraph and write True (T) or False (F)
Are you looking for a cheap , clean , effective source of power that doesn’t cause pollution or waste natural resources ? look no futher than solar energy from our sun At present, most of our electricity comes from the use of coal , gas , oil , or nuclear power This power could be provided by the sun One percent of the solar energy that reaches the Earth is enough to provide power for the total population
Many countries are already using solar energy Solar panels are placed on the roof of a house and the Sun’s energy is used to heat water The energy can be stored fo a number of days , so on cloudy days you can use solar energy too Sweden has an advanced solar energy program There, all buildings will be heated by solar energy and cars will use solar power instead of gas by the year 2015
1 Water can be heated by the Sun’s energy
2 On cloudy days , you can not use solar energy
3 Solar energy from our sun is a cheap , clean , effective source of power
4 One percent of the nuclear power is enough to provide the total population
5 Solar panels are placed in the room of a house
VIII Use the word cues to complete these sentences.
1 I / pleased / you / work hard
I am pleased that you are working hard
2 Loan / tired / she / stayed up late / watching TV
Loan is tired because she stayed up late watching TV
3 I / suggest / you / do / homework
I suggest that you should do your homework
4 If / it / rain / we / stay / home
If it rains, we will stay at home
5 I/ sorry/ break/ bicycle
I am sorry that I broke your bicycle
7 We / grateful / you / take / interest / us.
We are grateful that you took an interest in us
8 I / disappointed / you / not / see / me / yesterday.
I am disappointed that you didn’t see me yesterday
9 I / glad / they / come / here
I am glad thst they came here
10 I / proud / my team / win / the first award of the competion.
I am proud that my team won the first award of the competion
IX Rewrite the following sentences , beginning with “If”
1 Recycle or we won’t save natural resources
-> If we recycle, we will save natural resources
2 Be careful or you will fall over the rock
-> If you are careful, you won’t fall over the rock
3 He can do a part to save the environment by buying recycled products
-> If he buys recycled products, he can do a part to save environment
4 Putting garbage into the bins is one answer to minimize pollution
-> If we Put garbage into the bins, we will minimize pollution
5 Working too much will make you tired
-> If you work too much, you will be tired
6 The authorities are thinking of raising petrol prices It will have to cycle to work
-> If The authorities are thinking of raising petrol prices, we will have to cycle to work
7 Don’t be careless or you will break the vase
-> If you are careless, you will break the vase
8 Chris will pass his exams, but he has to work too hard
-> If Chris works hard, he will pass his exams
9 Allen can borrow it , but she must give it back next week
Trang 6-> If Allen gives it back next week, She can borrow it
10 We should take the map with us if we don’t want to lose our way in the forest
-> We will get lost in the forest, we don’t take the map with us
X: Complete the passage.
, , , , , , of, , but Are you looking (1) for …….a cheap, clean, effective source of power that doesn’t (2) , cause …… pollution or waste natural resources? Look no further than solar energy While most fuels now iin use are (3) being …… burned at an astonishing rate, solar energy, or power from the (4) sun …… , will last as long as the world (5) lasts …… This energy has already been (6) used …… to heat and cool homes and to cook food It has been used experimentally (7) in …… radio batteries and in furnishing power for telephone lines The
devices, (8) however ……, are cheap to operate but very expensive to produce
1) Is the solar energy an efficient source of power?
………yes, it is………
2) Where are the solar panels placed?
………on the roof of a house……… 3) How long can the energy be stored?
………for a number of days……… 4) Is the solar energy used in Vietnam now?
………yes, it is………
XI- Join each of the following pairs of sentences with “or, and, but, so or because”
1 I told a joke, but Nobody laughed
2 You must study harder, or You will go into another class
3 The city suffers from air pollution and from water pollution
4 I knew her family, so I did what I could for her
5 We can’t afford energy-saving light bulbs because The light bulbs are too expensive
XII Give correct formation of these words
1 The air in the city is _ (polluted)
2 Please listen to the lecture (carefully)
3 An accident happened because of driving (carelessly)
4 He was (disappointed) that they were not coming
5 Air and water _ (pollution) can make people fall ill
6 Plastic bags will cause _ (pollution)
7 Mr Brown is one of the _ (conservationists
8 We should make our world _ unpolluted)
9 I’m (disappointed) that you didn’t do your homework
10 Listen me _ (carefully) you can solve the problem
11 He is going to - all the bags ( collect)
12 She has ………… provided a picnic lunch for us ( kindly)
13 If the ………… continues, what will happen? ( pollution)
14 A large number of inhabitants have made……… on how to protect the environment ( suggestion)
15 Air and water ……… can make people fall ill ( pollution)
XIII Use the words given in the box to fill in the blanks to make a meaningful passage / something/ / / / / /
Our environment is in (1) trouble Modern ways of living and today’s industries are (2) polluting it Most people think there is (3) _ nothing _ they can do This is not true Everyone can do something to help (4) save our environment Here is a (5) list/ of things you can do.
- Help to cut pollution by (6) _ taking. _ the bus to work instead of your car.
- Buy fruit and (7) vegetables that have not been treated with pesticides.
- Recycle all your cans, bottles and paper There should be a (8) recycling center somewhere near
your home, so take them there
Most of the world’s energy comes from the
sun The sun’s energy is in wood, oil, and other things that people use for energy
XIV- Choose the correct connectives in brackets:
1- I opened the door looked out ( And / but)
2- I arrived 20 minutes early; I had time for a cup of tea ( So / because)
3- We looked everywhere ., we could not find the keys (However / Therefore)
4- The bus fare is expensive ., I prefer to walk (However / Therefore )
Trang 75- There were many people at the concert, we couldn’t get seats.( so / however)
6- I read the book, did not understand it ( But / or)
7- We had to wait we arrived early (Because / so)
8- I would like to go swimming ., I have too much work to do.( However / Therefore) 9- I go for a walk the sun is shining ( Because / so)
10- Do you know his address ? Telephone number? (But / or)
XV Choose the best answer to complete these following sentences.
1.We decided not to go out for meal _ we were too tired
2.My shoes are dirty I’d better take them before I come in
3.If you want to save money, you should he amount of water your family uses
4.Who is going to your children when you’re at work?
A look for B look up C look after D look out
5.Mary’s eyes are weak, , she has to wear glasses
6.If there is a mechanical problem, we suggest _ the manufacturer directly
A contact B contacting C to contact D be contacted
7.Our energy will soon come to an end if we don’t it
8.The children like to put _- nice clothes when they go out
9.I like bananas, my brother doesn’t
10.Please turn the gas I want to cook my lunch
11.He is tired he stayed up late watching TV
12.Her parents saw her _ at the railway station
13.Can you turn the light? It's too dark
A on B off C in D for
14 What are you looking ? My picture book I've lost it
A for B off C in D on
15 There are saving methods and inventions to use solar energy
A energy B energize C energetic D energetics
16 I had to pay much money this month for the international………
A calls B calling C call D called
17 A new air-conditioner will be this morning
A installed B to install C installing D to install
18 Scientists are looking for an way to reduce energy consumption
A effective B affection C effect D effectively
19 We can easily in the daylight
A read B to read C reading D readed
20 She won’t take all these suitcases she likes to travel light
A because B but C so D therefore
21.They are completely short of water now A number of people have died because of this
A shortage B short C shorten D shortly
22 She is very tired ,she has to finish her homework
A however B so C and D moreover
23 Is he an actor singer?
24 He’s tired he took a rest before continuing the work
A so B and C but D if
25 She forgot off the gas before going out
A turning B turn C to turn D turned
26 I suggest money for the poor people in our neighborhood
A saving B to save C save D saved
27 Who looks your children when you are away from home?
A after B at C for D to
29 We decided not to go out for meal we were too tired
30 My shoes are dirty I’d better take them I come in
Trang 8A away B up C on D off
31 If you want to save money, you should the amount of water your family uses
32 In order to save electricity, an ordinary 100-watt light bulb can be replaced by
A a 1000-watt light B a lamp C an electric bulb D an energy-saving bulb
33 Who is going to your children when you’re at work?
A look for B look up C look after D look out
34 Mary’s eyes are weak, …… , she has to wear glasses
35 If there is a mechanical problem, we suggest …… the manufacturer directly
A contact B to contact C contacting D be contacted
36 …… put on the guests on the first floor?
A Why don’t we B I suggest C How about D Let’s
37 My mother has just bought a house _ is full of roses
A whose garden B the garden C the garden of it D the garden whose 38: Today young generation is still fond ……….wearing jeans
39 Lan dropped his watch when he was the bus
A.turning off B getting off C.taking off D.going off
40 I’ll bring a raincoat it rains
41 They sell jeans…………the world
A.over all B all over C at over D over at
42 A new bridge is going ………….built in this area
43 Many students go there on weekends to have a rest after a ……week
A.working hard B.hardly C.hard workingD.worked
44 They have _ been here
A next week B already C yesterday D tomorrow
45 Would you please _tell me where the post office is?
XVI.Rewrite sentences using “BECAUSE”, “AND”, “BUT”, “SO”, “OR”, …
1 He left school because his life was hard.( because)
2 It was very dark, so I couldn’t see anything.(SO)
2 Because My brother was very busy, He couldn’t meet you (BECAUSE)
4 She was sick, so She went to bed early (SO)
5 She can’t work hard because she is old.(BECAUSE)
6 Because Tom is sick, He can’t go to school today (because)
7 If you study harder, You won’t go into another class.(if)
8The air in the countryside is very fresh, so People like to live there (SO)
XIX Choose the word or the phrase or sentence that best completes
1 _ air is one of the many problems we have to solve
A Pure B Polluted C Dust D Pleasant
2 I’ll be in trouble if I _my passport
3 We can eat at home or, you prefer, we can go to a restaurant
4 If it is raining this evening, I _
A will go out B don’t go out C go out D won’t go out
5 Minh’s English is excellent He speaks
A perfectly English B English perfectly
C perfect English D.English perfect
6 I’m disappointed _ people have spoiled this area
7 He to find a job but he had no luck
A hardly tried B hard tried C tried hardly D tried hard
8 We couldn’t go on a picnic as planned it was raining
Trang 99 If he hard today, can he have a holiday tomorrow?
10 we were tired, we sat down beside the stream
11 He _to find a job, but he had no luck
A tried hard B hardly tried C tried hardly D try hardly
12 Solar energy doesn’t cause
13 Are you looking forward _ my letter ?
A to see B to seeing C saw D seeing
14 “ _” means a piece of land full of rubbish
15 Dynamite _ many years ago
A has invented B invented C was inventedD were invented
16 Mary said to me “ can you speak English ?”
In reported speech the sentence will be
She asked me _
A if I can speak English B if I could speak English
C If can I speak English D If I could speak English ?
17.I live very far from school I wish
A I lived far from school B I lived close to school
C I live near the school now D I don’t live very far from school
18 If he hard today, can he have a holiday tomorrow?
19 Because there _ no buses, we had to take a taxi
20 We plan to this Saturday
A go hiked B go hiking C go to hike D go hike
21 I’ll have to buy a map _ I don’t know this area
22 It is recommended that he this course
23 He’s running so fast I catch up with him
A cannot hardly B can hardly C not hardly D could hardly
24 It is important that he _ take the final examination
25 I will be if she manages to sell that motorbike at a high price
A surprised B surprise C surprising D to surprise
26 Unless you understand I .explain it again to you
A am B was C will D would
27 If you know where she lives, please let me
A know B knew C known D to know'
28 If he a student, he will get a discount
A were B is C were D will be
29 you are interested in this film, don't go to see it at any cost
A Unless B If C Because D So
30 If you like that book l will give it you as my present
A to B from C at D for
31 If you are busy, we this by ourselves
32.How about dinner with us on Sunday ?
A.to have B.have C have had D having
33.My brother is very fond of to pop and rock music
A.listen B.to listen C listening D listens
34.Life today is very different life 50 years ago
A.to B.from C with D at
35.My uncle is a He often does research in his laboratory
A.science B.scientist C scientific D scientists
36.My father arrives in Singapore Monday evening
A.in B.at C from D on
37.John goes to his office every day except Sunday Sundays he stays at home
A.On B.At C In D From
38.I hope the weather will be nice the weekend
A.in B.to C at D between 39.Would you like to a party on Saturday ?
A.come B.coming C to come D will come
40.Helen is always in the kitchen She enjoys
A.cook B.to cook C cooks D cooking
Trang 1041.People wanted to see the opening of the ceremony, _they started leaving very early in the morning
A because B so C but D and
42.Vietnamese women prefer to wear modern clothing work
43.He with friends in an apartment in HCMC since last week
A living B has lived C lived D live
44.My mother said she busy then
A was B is C is being D being
45.My village lies near the of the mountain and by the river
A leg B.foot C.feet D legs
46.If you don’t study hard , you the exam
A failed B.will fail C.fail D have failed
47.It is Saturday , ?
A is it B it isn’t C isn’t it D.wasn’t it
48.She said that she learning English with you
A.like B.liked C.liking D.to like
49.They their home village last Sunday
A.visit B.visited C.was visiting D were visiting
50.He was born March 25 , 1992
A.at B.on C.in D.for
61.How about lunch with us on Sunday ?
A.to have B.have C.have had D.having
62.I suggest A shortcut through the park It’ll take much less time
A.to take B.take C taking D.is taking
63.If you don’t pay the bill within two week , electricity will be _
A.turn off B.come off C.cut off D.take off
64.We are leaving Hue for Ho Chi Minh city 4 o’clock this affternoon
A.in B.from C.to D.at
65 We’re very worried spending lots of money on energy in our home
A.about B.with C.to D.on
66.The villagers are interested in Natural resources but they don’t know how to do so
A.to conserve B.conserve C.conserving D.conserved
67.The girl was not pretty but she sang
A.beauty B.more beautiful C.beautiful D.beautifully
68.Check the faucets for dripping water you will have to pay an enormous water bill
A.although B.or C.because D.however
69.If we wasting water , there will be shortage of fresh water in a few decades
A.turn on B.turn off C.go on D.look for
70 You should all the lights before going out
A turn on B.turn off C.turn up D.turn out
XX Complete the sentences with because/ as/ since/ if/ when, or so.
1 We decided to go out to eat _ because/ as/ since we had no food at home.
2 He has a very important job _so he is particularly well-paid
3 Can I borrow that book when _ you’ve finished it?
4 No one was watching the television so _ I switched it off
5 because/ as/ since _ she changed a lot, we didn’t recognize her.
6 if _ you’ve ready, we can start now
7 I’m going away for a few days, I’ll phone you _when I get back
8 You should inform the police if_ your bicycle is stolen
9 Mathew went to bed because/ as/ since _ it was too late to go out.
10 _when you drive without driving license, you’re breaking the law
11 because/ as/ since the weather was bad, they delayed their trip
12 He will buy a new car if _ he saves up
13 I can’t drive fast _ because/ as/ since the street is very crowded.
XXI.Fill in the blanks with proper words, then answer the following questions.
/ / / Everyone wants to reduce (1) _ pollution But the pollution problem is as complicated as it is (2) _ serious It is complicated because much pollution is caused by things that benefit people For example, (3) _ exhaust/ from automobile caused large (4) _ percentage of air pollution But the automobile provides
transportation to millions of people (5) _/ factories discharge much of the material that pollutes air and water, but factories give employment to a large number of people
Thus, to end or greatly (6) reduce _ pollutions immediately, people would have to stop using many things that benefit them Most people do not want to do that, of course But pollution can be gradually reduces in several ways, (7) scientists _ and engineers can work to find ways to lessen the amount of pollution that such things
as automobiles and factories cause Government can pass and enforce laws that (8) _ require/ businesses and individuals to stop, or cut down on certain polluting activities