1. has changed - came
2. were talking - was starting - breaking
3. has done
4. has stood
5. have spent - got
6. were - studied
7. met - was working
8. had finished - sat
9. has
10. has been

11. B
12. B
13. C
14. A
15. A
16. B
17. C
18. B
19. A
20. C
21. B
22. A
23. B
24. A
25. C

- Câu bao nhiêu thế bạn ?

1. competing
2. mixture
3. improvement
4. medalist
5. Unfortunately
6. decision
7. countable
8.training
9. evidence
10. harmful

1. The man who is my teacher is tall.

2. I wish he could come to the party.

3. If I had enough money, I could buy a new house.

3. Two department stores have been built since 2007.

1. May I go out, Mom ?

2. Jim, you may eat some cake.

3. He doesn’t know what to do, he might ask Wendy.

4. He may come late.

5. You might have done the washing-up!

6. May this year bring you happiness and health!

7. He may be on holiday.

8. He might have been killed!

9. He may have phoned while I was having a shower.

10. There might be minerals in Mars.

1. A
2. D
3. B
4. C
5. A
6. D
7. B
8. C
9. B
10. A

1. I have not played football since 1970.
2. It has not rained for a fortnight.
3. Lucy has not worn that dress since Barbara's wedding.
4. My father hasn't been to VT for 2 years.
5. Betty has not ridden to work for a fortnight.
6. The last time he played tennis was in 1990.
7. The last time I met her was 2 months ago.
8. Tom has played the piano for 4 years.
9. I have cooked for the party for 4 hours. 
10. She has worked as a secretary for 2 years.

3. D