I. Choose the correct answer.

1. A. if

2. B. won't

3. B. gets

4. A. know

let sth do sth: cho phép ai làm gì

5. C. can't

6. A. is

7. A. use

8. B. on/up

go on doing sth: tiếp tục làm gì

end up: kết thúc, chấm dứt

9. B. will become

10. D. would go

11. B. because

12. C. going

suggest+ doing sth: đề nghị làm gì

13. A. is

14. A. dissolve: phân hủy

15. B. collecting

II. Sử dụng Because/ As/ Since

1. Jane was worried because/ as/ since she stayed at home alone.

2. Tom couldn't get the job because/ as/ since he was not confident during the interview.

3. We adore him because/ as/ since he is very talented.

4. I enjoy reading books because/ as/ since they help broaden my knowledge of the world.

5. I haven't finished my homework yet because/ as/ since I don't have enough materials.