Exercise 1: Choose the best answer
3. C. is polluted
4. C. had driven
5. B. had slept
6. D. would have said
8. C. knew
9. A. have
10. D. were
11. A. can
12. C. would
13. B. had
14. C. unless
15. B. Had
16. B. would have made
17. C. would make
18. B. will be/is
19. C. had finished it
20. A. wasn't working
=> Câu 1,2 bạn chụp hơi mờ nên mình k làm được :(