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D. Rewrite these sentences as directed:

1. He doesn’t eat fish when he isn’t extremely hungry.

à If____________________________________________________________

2. We didn’t hurry, so we were late for the concert.

à If____________________________________________________________

3. In order to get a driver’s license, you must be at least 18 years old.

à If you_________________________________________________________

4. A person must have a passport to be able to travel abroad.

à A person cannot travel abroad unless________________________________

5. Ann’s having a lot of trouble because she lost her passport last week.

à If_____________________________________________________________

6. Tom doesn’t do anything if you don’t tell him what to do.

à Unless_________________________________________________________

7. We must take steps to preserve natural resources, or the planet will be in danger.

à Unless__________________________________________________________

8. It’s such a pity your sister can’t come as well.

à If only__________________________________________________________

9. The soil would become poor unless the farmer added fertilizers.

à If ______________________________________________________________

10. You probably won’t have time, but I’d like you to come and see.

à If _______________________________________________________________

11. There were such a lot of traffic; that’s why we are late.

à Had______________________________________________________________

12. I couldn’t have managed it without your help.

à If_______________________________________________________________

13. It was her determination which enable her to get better so quickly.

à If__________________________________________________________________

14. He doesn’t get a job, so he can’t pay his bills.

à If_________________________________________________________________

15. She isn’t fit because she sits around too much.

à If__________________________________________________________________

16. The fire brigade came immediately, so the house didn’t burn down.

à If__________________________________________________________________

17. Sue walked to work in the rain and caught a cold.

àIf___________________________________________________________________

18. I was sick yesterday, so I didn’t go to class.

à If __________________________________________________________________

19. Because Alan never eats breakfast, he always overeats at lunch.

à If __________________________________________________________________

20.The teacher is very angry now. His pupils did their homework carelessly

-> If_______________________________________________________________

lamf hooj 1 2 3 4 5 6 7 8 9 10 11 12 13 và 15

hộ mình nhanhhh nhaaaa

3
19 tháng 1 2018

D. Rewrite these sentences as directed:

1. He doesn’t eat fish when he isn’t extremely hungry.

à If he isn't extremely hungry, he doesn't eat fish.

2. We didn’t hurry, so we were late for the concert.

à If we had hurried, we wouldn't have been late for the concert.

3. In order to get a driver’s license, you must be at least 18 years old.

à If you want to get a driver's license, you must be at least 18 years old.

4. A person must have a passport to be able to travel abroad.

à A person cannot travel abroad unless he has a passport.

5. Ann’s having a lot of trouble because she lost her passport last week.

à If Ann hadn't lost her passport last week, she wouldn't be having a lot of trouble.

6. Tom doesn’t do anything if you don’t tell him what to do.

à Unless you tell Tom what to do, he doesn't do anything.

7. We must take steps to preserve natural resources, or the planet will be in danger.

à Unless we take steps to preserve natural resources, the planet will be in danger.

8. It’s such a pity your sister can’t come as well.

à If only your sister could come as well.

9. The soil would become poor unless the farmer added fertilizers.

à If the farmer added fertilizers, the soil wouldn't become poor.

10. You probably won’t have time, but I’d like you to come and see.

à If you have time, I'd like you to come and see.

19 tháng 1 2018

11. There were such a lot of traffic; that’s why we are late.

à Hadn't there been such a lot of traffic, we wouldn't have been late.

12. I couldn’t have managed it without your help.

à If you hadn't helped me, I couldn't have managed it.

13. It was her determination which enable her to get better so quickly.

à If she hadn't been determined, she wouldn't have got better so quickly.

14. He doesn’t get a job, so he can’t pay his bills.

à If he got a job, he could pay his bills.

15. She isn’t fit because she sits around too much.

à If she didn't sit around too much, she would be fit.

16. The fire brigade came immediately, so the house didn’t burn down.

à If the fire brigade hadn't come immediately, the house would have burned down.

17. Sue walked to work in the rain and caught a cold.

àIf Sue hadn't walked to work in the rain, she wouldn't have caught a cold.

18. I was sick yesterday, so I didn’t go to class.

à If I hadn't been sick yesterday, I would have gone to class.

19. Because Alan never eats breakfast, he always overeats at lunch.

à If Alan ate breakfast, he wouldn't always overeat at lunch.

20.The teacher is very angry now. His pupils did their homework carelessly

-> If the teacher's pupils hadn't done their homework carelessly, he wouldn't be very angry now.

29 tháng 6 2017

1,If we had hurried, we wouldn't have been late for the concert.

2,If you are 18 years old, you get a driver's lisence.

3,If Ann hadn't lost her passport last week,she wouldn't have had a lot of trouble.

4,If the farmer didn't add fertilizers, the soil would become poor.

5,If she hadn't been her determination, she wouldn't have gotten better so quickly

1. The flight from Hanoi to London lasted for twelve hours.à It ………………………………………………………………….2. We left home too late to catch the 9 o’clock train.à We didn’t …………………………………………………………3. My sister eats little meat because she doesn’t want to put on weight.à My sister eats little meat so as ……………………………………..4. The table was so heavy that we couldn’t move it.à The table...
Đọc tiếp

1. The flight from Hanoi to London lasted for twelve hours.
à It ………………………………………………………………….
2. We left home too late to catch the 9 o’clock train.
à We didn’t …………………………………………………………
3. My sister eats little meat because she doesn’t want to put on weight.
à My sister eats little meat so as ……………………………………..
4. The table was so heavy that we couldn’t move it.
à The table was too …………………………………………………..
5. His parents made him study hard for the exam.
à He……………………………………………………………………
6. Both my brother and I are too young to drive.
à Neither my brother …………………………………………………..
7. Reading scientific book is one of my interests.
à I am ………………………………………………………………..
8. Nam plays the piano better than Lan.
à Lan doesn’t …………………………………………………………
9. Her behavior annoyed me.
à I found ………………………………………………………………
10. He prefers golf to tennis.
à He’d rather play ………………………………………………………

Help me

2
14 tháng 4 2020

Bạn cần học Tiếng Anh online không ạ. Học trên toàn quốc. Nếu có liên hệ với mình ạ.

SĐT :0978693475

22 tháng 4 2020

1. It took 12 hours to fly from HN to London.

2. We didn't leave home early enough to catch the 9 o'clock train.

3. My sister eats little meat so as not to put on weight.

4. The table was too heavy for us to move.

5. He had to study hard for the exam.

6. Neither my brother nor I am too young to drive.

7. I am interested in reading scientific books.

8. Lan doesn't play the piano as well as Nam.

9. I found her behavior annoying.

10. He'd rather play golf than play tennis.

6 tháng 7 2021

VIII. Rewrite the sentences.

1. John smoked a lot a year ago, but now he doesn’t smoke any more. àJohn used TO SMOKE A LOT 

2. It’s time for you to go to school. à  It’s time you WENT TO SCHOOL

3. How long is it since yu saw Tom? à When DID YOU SEE TOM?

4. please keep silent in the classroom. à I’d rather you KEPT SILENT IN THE CLASSROOM

5. He can’t pass the examination. à  He wishes HE COULD PASS THE EXAMINATION

6. We can’t go out because of heavy rain. à We wish WE COULD GO OUT

7. I don’t like you to come to class late. à  I’d rather you DIDN'T COME TO CLASS LATE

8. What a pity! He can’t come here. à I wish HE COULD COME HERE

9. They often went to Vung Tau at weekends. à They used TO GO TO VT AT WEEKENDS

10. Maryam and Lan have been pen pals for over 2 years. à Maryam and Lan have written WITH EACH OTHER FOR OVER 2 YEARS

6 tháng 7 2021

VIII. Rewrite the sentences.

1. John smoked a lot a year ago, but now he doesn’t smoke any more. àJohn used  to smoke a lots a year ago.

2. It’s time for you to go to school. à  It’s time you  went to school

3. How long is it since yu saw Tom? à When  did you last see Tom ?

4. please keep silent in the classroom. à I’d rather you  kept silent in the classroom

5. He can’t pass the examination. à  He wishes  he could pass the examination.

6. We can’t go out because of heavy rain. à We wish  it didn't rain so heavily that we could go out.

7. I don’t like you to come to class late. à  I’d rather you

8. What a pity! He can’t come here. à I wish  didn’t come to class late.

9. They often went to Vung Tau at weekends. à They used to go to Vung tau at weekends.

 

10. Maryam and Lan have been pen pals for over 2 years. à Maryam and Lan have written  to each other for over two years. 

 

4 tháng 6 2022

1. She hasn’t written to me for a long time 

à It’s a long time since she wrote to me

2. It's 3 months since he wrote to me. 

à He hasn’t written to me for 3 months

3. The last time I was aboard was in the summer of 1978. 

à I haven’t been aboard since in the summer of 1978

4. I haven't seen him for 2 months. 

 à I last saw him 2 months ago

5. I haven't been to a concert for over a year.  

The last time i was at a concert was over a year ago

6. It’s over six months since John had his hair cut. 

John hasnt had his hair cut for over six months

7. I haven’t enjoyed myself so much for years 

à It is a year since i enjoyed myself so much

 

1)The weather forecast was inaccurate ,so we didn't take the right precaution. -Had.................................................................................. 2)You must speak slowly or he'll not be able to understand you. -Unless............................................................... 3)Do as I tell you 'll regret about it. -Unless.............................................. 6)Mary didn't work hard enough. She failed in her exams. -If...
Đọc tiếp

1)The weather forecast was inaccurate ,so we didn't take the right precaution.

-Had..................................................................................

2)You must speak slowly or he'll not be able to understand you.

-Unless...............................................................

3)Do as I tell you 'll regret about it.

-Unless..............................................

6)Mary didn't work hard enough. She failed in her exams.

-If mary....................................................

7)But for his help , I would have gone bankrupt.

-If....................................................................

8)We got lost because we didn't have a map.

-If we.....................................................

9)You may get hungry on the train , so take some sandwiches.

-In care.....................................................................

10)If there is an emergency, ring this number .

-In................................................

11)I'm having a lot of trouble now because I lost my passport last week.

-If..............................................................................

12)I only made that terrible mistake because I wasn't thinking.

-If I.................................................

13)Your car might break down on the rough mountain road, so take plenty of spare parts.

-In care............................................................

14)It was his incompetence which led to their capture.

-If.................................................................

15)I only bought the dog because my children wanted a pet.

-If....................................................................

16)Without this treatment, the patient would have died.

-If he................................................................

17)In the event of nuclear wearpons being used ,we are doomed.

-If it should............................................................................

18)Mr.Miller lost his job because he was late every day.

-If...............................................

19)If I had known she was sick , I would have visited her.

-Had........................................................

20)The only thing that prevented the passing of the bill was the death of the Prime Minister.

-Had it not...............................................................

21)If ask me in advance , I'll be willing to work orvertime.

-Provided that.................................

22)You'd better not touch that switch.

-If I.......................................

1
18 tháng 8 2017

1)The weather forecast was inaccurate ,so we didn't take the right precaution.

-Had the weather forecast not been inaccurate , we would have taken the right precaution.

2)You must speak slowly or he'll not be able to understand you.

-Unless you speak slowly ,he'll not be able to understand you.

3)Do as I tell or you 'll regret about it.

-Unless you do as I tell, you 'll regret about it.

6)Mary didn't work hard enough. She failed in her exams.

-If mary had worked hard enough,she wouldn't have failed in her exams.

7)But for his help , I would have gone bankrupt.

-If. he hadn't helped, I would have gone bankrupt.

8)We got lost because we didn't have a map.

-If we had had a map, we would not have got lost

9)You may get hungry on the train , so take some sandwiches.

-In case you get hungry on the train , take some sandwiches.

10)If there is an emergency, ring this number .

-In case of emergency, ring this number .

11)I'm having a lot of trouble now because I lost my passport last week.

-If i hadn't lost my passport last week, i wouldn't have a lot of trouble now

12)I only made that terrible mistake because I wasn't thinking.

-If I had been thinking, i wouldn't have made that terrible mistake

13)Your car might break down on the rough mountain road, so take plenty of spare parts.

-In case your car break down on the rough mountain road, take plenty of spare parts.

14)It was his incompetence which led to their capture.

-If he hadn't been incompetent, they wouldn't have been captured

15)I only bought the dog because my children wanted a pet.

-If my children hadn't wanted a pet, I wouldn't have bought the dog

16)Without this treatment, the patient would have died.

-If he hadn't been treated, the patient would have died.

17)In the event of nuclear wearpons being used ,we are doomed.

-If it should happen that nuclear weapons are used, we are all doomed.

18)Mr.Miller lost his job because he was late every day.

-If Mr.Miller hadn't been late everyday, he wouldn't have lost his job

19)If I had known she was sick , I would have visited her.

-Had i known she was sick , I would have visited her.

20)The only thing that prevented the passing of the bill was the death of the Prime Minister.

-Had it not been for the death of the Prime Minister, the bill would have passed

21)If ask me in advance , I'll be willing to work orvertime.

-Provided that you ask me in advance , I'll be willing to work orvertime.

22)You'd better not touch that switch.

-If I were you, i wouldn't touch that switch.

Rewrite the sentences without changing the meaning. 1. He can’t go out because he has to study for his exam. → If .................................................................................................................................. 2. She is lazy so she can’t pass the exam. → If .................................................................................................................................. 3. He will pay me tonight; I will have enough money to buy a...
Đọc tiếp

Rewrite the sentences without changing the meaning.

1. He can’t go out because he has to study for his exam.

→ If ..................................................................................................................................

2. She is lazy so she can’t pass the exam.

→ If ..................................................................................................................................

3. He will pay me tonight; I will have enough money to buy a car.

→ If ..................................................................................................................................

4. He smokes too much; that’s why he can’t get rid of his cough.

→ If ..................................................................................................................................

5. She is very shy, so she doesn’t enjoy the party.

→ If ..................................................................................................................................

6. I get a work permit. I will stay for another month.

→ If ..................................................................................................................................

7. He doesn’t take any exercises. He is so unhealthy.

→ If ..................................................................................................................................

8. We can’t get the ticket because I don’t have the right change.

→ If ..................................................................................................................................

9. Study hard or you won’t pass the exam.

→ If ..................................................................................................................................

10. Don’t be impatient or you will make mistakes.

→ If ..................................................................................................................................

27
22 tháng 3 2021

Rewrite the sentences without changing the meaning.

1. He can’t go out because he has to study for his exam.

→ If he didn't have to study for his exam, he could go out

2. She is lazy so she can’t pass the exam.

→  If she weren’t lazy, she could pass the exam.

3. He will pay me tonight; I will have enough money to buy a car.

→ If he pays me tonight, I would have enough money to buy a car.

4. He smokes too much; that’s why he can’t get rid of his cough.

→ If  he didn't smoke too much, he would  get rid of his cough

5. She is very shy, so she doesn’t enjoy the party.

→ If she weren’t shy, she could enjoy the party.

6. I get a work permit. I will stay for another month.

→ If I get a work permit, I will stay for another month 

7. He doesn’t take any exercises. He is so unhealthy.

→ If he didn’t take any exercises, he is so unhealthy

8. We can’t get the ket because I don’t have the right change.

→ If I had the right change,we could get the ket

9. Study hard or you won’t pass the exam.

→ If you study hard, you would pass the exam

10. Don’t be impatient or you will make mistakes.

→ If you are impatient, you will make mistakes.

19 tháng 12 2021

1. The river which flows through Ho Chi Minh City is the Sai Gon River.

2. Mr Phong who is supposed to be at the meeting hasn’t come yet.

3. Our solar system is in a galaxy which is called the Milky Way.

4. I come from a city which is located in the southern part of the country.

5. I’ve recently gone back to the town where I was born.

6. Do you know the name of the hotel where John is staying?

7. There are some words which are very difficult to translate.

8. What is the name of the man whose car you borrowed?

9. This watch which I have lost costs a lot of money.

10. We were given a lot of information most of the which was useless.

I. EXERCISES1.he ( phone) ................. me if he knows my number2. please call the doctor If your son ( have ) ............. a temperature3. If you don’t study your lesson , you ( have) .............. poor marks in the examination4. If Son passes his exam , he (go) .................. to university5. What you (do) .......... the first train , they can go with us6. If they (not miss) ......... the first train, they can go with us7 I’ll come to see you Ì I have (have).............. spare...
Đọc tiếp

I. EXERCISES

1.he ( phone) ................. me if he knows my number

2. please call the doctor If your son ( have ) ............. a temperature

3. If you don’t study your lesson , you ( have) .............. poor marks in the examination

4. If Son passes his exam , he (go) .................. to university

5. What you (do) .......... the first train , they can go with us

6. If they (not miss) ......... the first train, they can go with us

7 I’ll come to see you Ì I have (have).............. spare time

8 If I ( have) ....... money , I (travel) ........ help you

9 He (must pass) ....... the coming written test If he (attend)........ the course

10 What you (do) ............. If you (have) ...............free time

11 Let him (do) .... what he wants

II SUPPLY THE CORRECT FORM OF VERBS

1 You often (see) .......... your parent ?

2 WE (not try)................. our best to study yet

3 Last night, the fire (break)..........out while everybody (sleep) ................

4 I think she (leave)........ as soon as she gets the new

5 This house (buy) ........10 years ago

6 My brother(work).............. in this factory since 1989

7 he used (phay) ..... football when he (be) ........10 years old

8 What (happen) ........ to you yesterday ?

9 At present , that auther (write)............a historical novel

10 You (finish)........ your homework

11 he wisher he (can) ...go abroad

12 My family (live) .....in HCM city for 10 years

13 what you (do) ... if you won the lottery ?

14 This room (pant) .......since late well

15 She asked her son ( not stay)......... up late

16 Please stop (ask) ........ I question

17 My father toid his children ( try ) ..... to study to get scholarship

18 What time will you finish ( study)........... today

19 It’s very interesting(go)........for a walk with the fresh air

20 Do you hear someone(call).........for the help in the distence

GIÚP MÌNH VÓI MAI MÌNH PHẢI NỘP BÀI RỒI

0
29 tháng 7 2018

Câu điều kiện

1.If it rains this evering. I [not go]......won't go........out.

2.Lan [miss].....will miss.......the bus if she does not hurry.

3.I Ha [not be]........isn't.....careful, he will drop the cup

4.Mrs. Nga [join].......will join.........us if she finishes her work early.

5.If Mrs.Binh writes a shopping list, she [not forget].....won't forget.........what to buy

6.If I see him I [give]......will give.......a lift.

7.If he [eat]....eats........all that, he will be ill.

8.If I find your passport I [telephone]......will telephone..........you at one.

9.If he [read].......reads.....in bad light he will ruin his eyes.

10.Someone [steal].....will steal.......your car if you leave it unlocked

11.If you want to improve English, We [can help].......can help.......you

12.If you want to get good , you [must study]....must study..........hard.

13.If you [not pay]....do not pay..........in advance, You must give us a 10 percent deposit

14.If the rice paddies are polluted , the rice plants [will die]......will die.......

29 tháng 7 2018

lm nah đấy bn 1 like

1. If people solve the problem of smoke from vehicles and factories, the air _____ pure and fresh. A. is B. was C. will be D. would be 2. If you post false information on the Internet, you _____fined. A. gets B. got C. would get D. will...
Đọc tiếp

1. If people solve the problem of smoke from vehicles and factories, the air _____ pure and fresh. A. is B. was C. will be D. would be 2. If you post false information on the Internet, you _____fined. A. gets B. got C. would get D. will get 3. I believe that if all the people _____ the government’s instructions, we ____COVID-19 from spreading. A. don’t follow/ will prevent B. followed/ will prevent C. follow/ would prevent D. follow/ will prevent 4. Do you think there would be less conflict in the world if all people _____ the same language? A. spoke B. speak C. had spoken D. will speak 5. If our schools are still closed because of the pandemic, we _____to study online. A. wouldn’t B. would try C. tried D. will try 6. If I ____you, I ____many subjects online instead of playing video games. A. was/ will study B. am/ will study C. were/ would study D. am/ would study 7. If people need more paper, more trees _____. A. will cut down B. cut down C. will be cut down D. are cutting down 8. My English is not good. If I ___ English well, I ___ able to get a good job in a foreign company. A. speak/ can be B. spoke / were C. speak/ were D. spoke/ would be 9. If everybody _____to the fight against COVID-19, we will win soon. A. contribute B. contributes C. are contributing D. is contributed 10. If people protect the forest, a lot of trees _____. A. will be preserved B. will preserve C. preserve D. would preserve 11. If you were me, what _____? A. you would do B. will you do C. do you do D. would you do 12. People don’t trust him because he tells lies. A. If he tells lies, people won’t trust him. B. If he didn’t tell lies, people would trust him. C. If he doesn’t tell lies, people will trust him. D. If he told lies, people wouldn’t trust him. 13. The government limits travel and close contact among people, so we can prevent COVID-19 from spreading. A. If the government didn’t limit travel and close contact among people, we couldn’t prevent COVID-19 from spreading. B. If the government doesn’t limit travel and close contact among people, we can prevent COVID-19 from spreading. C.If the government doesn’t limit travel and close contact among people, we could prevent COVID-19 from spreading. D. If the government limited travel and close contact among people, we couldn’t prevent COVID-19 from spreading. 14. Wear a face mask when you are with many people, or you will be at risk. A. If you wear a face mask when you are with many people, you will be at risk. B. If you don’t wear a face mask when you are with many people, you will be at risk. C. If you didn’t wear a face mask when you are with many people, you would be at risk. D. If you don’t wear a face mask when you are with many people, you would be at risk. 18. We/ should/ maintain/ personal space/ avoid/ crowds/ if/ we/ want/ be/ safe/ now. A. We should be maintained personal space and avoid crowds if we want to be safe now. B. We should maintain personal space and avoid crowds if we want to be safe now. C. We should maintain personal space and avoid crowds if we wanted to be safe now. D. We should maintain personal space to avoid crowds if we want be safe now. 19. Her English/ not/ be/ rusty/ she/ used/ more often. A. Her English wouldn’t be rusty if she uses it more often. B. Her English wouldn’t be rusty if she has used it more often. C. Her English wouldn’t be rusty if she is using it more often. D. Her English wouldn’t be rusty if she used it more often. 20. If people/ solve/ problem/ smoke from vehicles, the air/ be pure and fresh. A. If people solved the problem of smoke from vehicles, the air is pure and fresh. B. If people solve the problem of smoke from vehicles, the air was pure and fresh. C. If people solve the problem of smoke from vehicles, the air will be pure and fresh. D. If people solve the problem of smoke from vehicles, the air would be pure and fresh.
1
4 tháng 4 2020

1. If people solve the problem of smoke from vehicles and factories, the air _____ pure and fresh.

A. is B. was C. will be D. would be

2. If you post false information on the Internet, you _____fined.

A. gets B. got C. would get D. will get

3. I believe that if all the people _____ the government’s instructions, we ____COVID-19 from spreading.

A. don’t follow/ will prevent

B. followed/ will prevent

C. follow/ would prevent

D. follow/ will prevent

4. Do you think there would be less conflict in the world if all people _____ the same language?

A. spoke B. speak C. had spoken D. will speak

5. If our schools are still closed because of the pandemic, we _____to study online.

A. wouldn’t B. would try C. tried D. will try

6. If I ____you, I ____many subjects online instead of playing video games.

A. was/ will study B. am/ will study C. were/ would study D. am/ would study

7. If people need more paper, more trees _____.

A. will cut down B. cut down C. will be cut down D. are cutting down

8. My English is not good. If I ___ English well, I ___ able to get a good job in a foreign company.

A. speak/ can be B. spoke / were C. speak/ were D. spoke/ would be

9. If everybody _____to the fight against COVID-19, we will win soon.

A. contribute B. contributes C. are contributing D. is contributed

10. If people protect the forest, a lot of trees _____.

A. will be preserved B. will preserve C. preserve D. would preserve

11. If you were me, what _____?

A. you would do B. will you do C. do you do D. would you do

12. People don’t trust him because he tells lies.

A. If he tells lies, people won’t trust him.

B. If he didn’t tell lies, people would trust him.

C. If he doesn’t tell lies, people will trust him.

D. If he told lies, people wouldn’t trust him.

13. The government limits travel and close contact among people, so we can prevent COVID-19 from spreading.

A. If the government didn’t limit travel and close contact among people, we couldn’t prevent COVID-19 from spreading.

B. If the government doesn’t limit travel and close contact among people, we can prevent COVID-19 from spreading.

C.If the government doesn’t limit travel and close contact among people, we could prevent COVID-19 from spreading.

D. If the government limited travel and close contact among people, we couldn’t prevent COVID-19 from spreading.

14. Wear a face mask when you are with many people, or you will be at risk.

A. If you wear a face mask when you are with many people, you will be at risk.

B. If you don’t wear a face mask when you are with many people, you will be at risk.

C. If you didn’t wear a face mask when you are with many people, you would be at risk.

D. If you don’t wear a face mask when you are with many people, you would be at risk.

18. We/ should/ maintain/ personal space/ avoid/ crowds/ if/ we/ want/ be/ safe/ now.

A. We should be maintained personal space and avoid crowds if we want to be safe now.

B. We should maintain personal space and avoid crowds if we want to be safe now.

C. We should maintain personal space and avoid crowds if we wanted to be safe now.

D. We should maintain personal space to avoid crowds if we want be safe now.

19. Her English/ not/ be/ rusty/ she/ used/ more often.

A. Her English wouldn’t be rusty if she uses it more often.

B. Her English wouldn’t be rusty if she has used it more often.

C. Her English wouldn’t be rusty if she is using it more often.

D. Her English wouldn’t be rusty if she used it more often.

20. If people/ solve/ problem/ smoke from vehicles, the air/ be pure and fresh.

A. If people solved the problem of smoke from vehicles, the air is pure and fresh.

B. If people solve the problem of smoke from vehicles, the air was pure and fresh.

C. If people solve the problem of smoke from vehicles, the air will be pure and fresh.

D. If people solve the problem of smoke from vehicles, the air would be pure and fresh.