1. They / studied / 6 o’clock

=> They studied at 6 o'clock.

2. He / written / a novel / 2 years

=> He has written a novel for 2 years.

3. He / not finished / it yet

=> He hasn't finished it yet.

4. I / not meet / her / 2 years

=> I haven't met her for 2 years.

5. Daniel / already spend / all the money

=> Daniel already have spent all the money.

6. We / learn / Dong Khoi school / 3 years

=> We have learnt in Dong Khoi school for 3 years.

7. You/ have / your breakfast / yet ?

=> You have eaten your breakfast yet?

8. I / not / know / him / before

=> I haven't known him berofe.

9. It’s / best holiday / I / ever / have

=> It's best holiday I ever had

10. They / never / see / him before

=> They have never seen him berofe.

11. He / have / a bad cold / a week.

=> He have a bad cold for a week.

12. How long / you / work / here

=> How long you have worked here

13. This is / worst mistake / ever / make

=> This is a worst mistake I have ever made.

14. Minh / live / this town / 1986.

=> Minh has lived in this town since 1986.

15. We / not come / here / a long time.

=> We haven't come here for a long time.

16. They / not speak / to each other / they / leave / the town.

=> They haven't spoken to each other since they have left the town.

17. I / just receive / a letter / my parents.

=> I have just received a letter from my parents.

18. How long / you / be / here ?

=> How long you have been here?

19. I / not eat / this kind of food before

=> I haven't eaten this kind of food berofe.

20. He / not see / his brother / they say goodbye / the airport / 1990

He hasn't seen his brother since they say goodbye in the airport at 1990.

Đáp án là A.

Đáp án là C.

Đáp án là B.

Đáp án là D.

clean air

Chúc bạn học tốt

dirty air nha

People need to breathe. If they don’t breathe, they (1) ______on______ die. But how clean is the air people breathe? If they breathe (2) _____with______ air, they will have breathing problems. Plants and animals need (3) ____of______ air too. A lot of the things in our lives create harmful gases and (4) ___at______the air dirty, like cars, motorbikes, and factories. Dirty air is called polluted air. Air pollution can also make our Earth warmer.The problem of air pollution stared ( 5 )....of.. the burnin a lot of coal in homes and factories

People need to breathe. If they don’t breathe, they (1) ______on______ die. But how clean is the air people breathe? If they breathe (2) _____with______ air, they will have breathing problems. Plants and animals need (3) ____of______ air too. A lot of the things in our lives create harmful gases and (4) ___at______the air dirty, like cars, motorbikes, and factories. Dirty air is called polluted air. Air pollution can also make our Earth warmer.The problem of air pollution stared ( 5 )....of.. the burnin a lot of coal in homes and factories

People need to breathe. If they don’t breathe, they (1) _____on______ die. But how clean is the air people breathe? If they breathe (2) ______with_____ air, they will have breathing problems. Plants and animals need (3) _____of_____ air too. A lot of the things in our lives create harmful gases and (4) ____at_____the air dirty, like cars, motorbikes, and factories. Dirty air is called polluted air. Air pollution can also make our Earth warmer.The problem of air pollution stared ( 5 )...of... the burnin a lot of coal in homes and factories

1. If/you/burn rubbish/you/produce harmful smoke

-> If you burn rubbish, you will produce harmful smoke 

2.If/we/reuse bottles/we/save a lot of money

-> If we reuse bottles, we will save a lot of money 

3. If/students/use recycled paper/they/save/trees

-> if students use recycled paper, they will save the trees

4. If/students/plant trees in the schoolyard/their school/greener place

-> if students plant trees in the school yard, their school will be a greener place

1. If/you/burn rubbish/you/produce harmful smoke

-> If you burn rubbish, you will produce harmful smoke 

2.If/we/reuse bottles/we/save a lot of money

-> If we reuse bottles, we will save a lot of money 

3. If/students/use recycled paper/they/save/trees

-> if students use recycled paper, they will save the trees

4. If/students/plant trees in the schoolyard/their school/greener place

-> if students plant trees in the school yard, their school will be a greener place

1. He drives to work every day.

2. I don't think you're right.

3. Do we have enough time?

4. I eat cereal...

5. Do they write...?

6. You watch a lot of TV.

7, He doesn't read...

8. Does she dance often?

9. Where do you come on Mondays?

10. What do you do...?