12. a
13. c
14. c
15. d
16. d
17. c
18. b
19. c
20. a
21. c
22. b

Bài 2:
Kevin teaches mathematics at a high school. He enjoys his teaching very much, and he always feels very self-confident and proud when he is standing on the teaching platform. Some of his ex-classmates have just offered him a chance to join them in a new company to produce computer software for businesses. Everyone thinks that it will do very well.

Bài 3: Writing
1. reading
2. seeing
3. to help
4. to study

* Bài Cirle the underlined... cuối cùng ấy
1. A -> had lived
2. C -> had fished

* Bài còn lại
10. A
13. C
14. A
15. C
16. D
17. C
18. A
19. C
20. C
21. A