II. Choose the correct answer A, B, C or D to complete the passage. 

People need to breathe. If they don’t breathe, they (1) ____________ die. But how clean is the air people breathe? If they breathe (2) ___________ air, they will have breathing problems. Plants and animals need (3) __________ air too. A lot of the things in our lives create harmful gases and (4) _________the air dirty, like cars, motorbikes, and factories. Dirty air is called polluted air. Air pollution can also make our Earth warmer. 

1. A. won’t B. are C. must D. will

2. A. clean B. fresh C. dirty D. cleaner

3. A. clean B. safe C. dirty D. polluted

4. A. make B. get C. give D. made

II. Complete the sentences using the past simple form of the verbs.
1- I (be).......................................a student 2 years ago.
2- He (be).................................. a doctor two years ago.
3- They (be)................................. farmers last year.
4. Her aunt (take)................................... her to see Cham Temple last year.
5. Tuan (have).............................. a new bike yesterday.
6. She (not buy).................................. a new ruler yesterday?
7. He (not talk)..................... with his parents about his vacation in Da Lat last year.
8. They (not come).................................. school yesterday? 
9. The windows (not close)............................ yesterday?
10. We (not return) ......................................at home last Monday.
11. She (not eat ) .............................................fish and crab yesterday.
12. Lan (not go )................................. Ho Chi Minh city two years ago.
13. My parents (not take).................................to Vung Tau last week.
14. We (not have)......................................a lot of friends in Ha Noi.
15. Lan and Hoa (be).................................... your school two years ago?
16. What they (play) ...............................last week?
17. What Hoa (try)...................................................... on yesterday?
18. Who (talk) ....................................to about the film on TV last Monday?
19. Where they (stop) .....................................on their way back last Sunday?
20. What the student (wear)...................................... at school two years ago?