1. Unless you do these exercises more carefully, you will fail exams

2.I wasn't helped to clean the floor.

3. This teacher, whose lectures I like very much, is very strick.

4. Minh asked Lan if she would fly to HCM city to pick him up the next day.   
5. It's raining heavily, so I can't go to the beach. 
6. Pineapples and longans are exported to many countries.

7.Hoa asked Lan if she was learning at her school.

8. You played tennis better than I did.

9. The dictionary which you bought for me yesterday is of great help. 
10. It is such a difficult lesson that I can't do it. 

Chúc bạn học tốt trong năm học tới nha:))