1. were walking
2.  was enjoying
3. was taking
3. were playing
5. was vacuuming
6. was painting 
7. Was he resting
8. was reading
9. was speaking
10. was studying

1. Because of his broken leg, he could not take part in the game.

2. The statue of Liberty was presented to the USA by France in 1976.

3. She said she was working in a restaurant, and didn't care much for it.

4. No house on this street is older than Miss Duyen's house. 

Quan hệ từ: của.

1. was written
2. hasn't been pulished
3. had been stolen
4. is served
5. has been delivered
6. had been
7. was made
8. were caught
9. will be increased
10. will be redecorated
11. was dessighned
12. is being reparied
13. is taken
14. must be sent
15. already been offered.
16. are grown
17. was taught
18. was written
19. were warned
20. had been eaten
21. have already been given
22. was disturned
23. is made
24. Have the packages been delivered
25. was seen

`(x-2)^2-(x-3)(x-1)`

`=x^2-4x+4-(x^2-x-3x+3)`

`=x^2-4x+4-x^2+4x-3`

`=(x^2-x^2)+(4x-4x)+(4-3)`

`=1`

`=>` ĐPCM.

1. abroad

2. came

- Lười wa, xóa luôn cho lành.

- Mới sửa đề hay như nào ấy chứ lúc mình làm thấy có mỗi 10 câu ?