51. B

52. A

1. C

2. A

3. C

4. B

5. B

6. B

7. C

8. A

9. B

10. D

11. C

12. B

Chọn A

Chọn C

Chọn C

1. A

2. C

3. A

4. B

5. C

1. A

2. B

3. C

1. D. are
2. C. was
3. B. has been
4. B. are
5. B. are

Part A: Multiple Choices

1. B
2. D
3. A
4. C
5. D
6. C
7. D
8. B
9. B
10. B
11. B
12. B
13. C
14. A
15. C
16. A
17. A
18. A
19. B
20. C
21. B
22. A
23. D
24. C
25. A

Part B: Error Recognition

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

Part C: Write the Correct Tenses

1. were watching / failed
2. has changed / came
3. have spent / got
4. has had
5. comes
6. was
7. were you doing / rang
8. haven't seen
9. is coming
10. worked
11. discovered
12. are singing
13. Have you received
14. have Bob and Mary been
15. has asked
16. was watching
17. did / go
18. is coming
19. haven't talked
20. felt / was doing

1. B
2. B
3. A
4. B
5. A
6. A
7. C
8. C
9. A
10. D
11. A
12. B
13. D
14. B
15. B
16. C
17. C
18. A
19. B
20. C
21. A
22. C
23. B
24. A
25. A
26. B
27. A
28. C
29. A
30. B
31. C
32. C
33. A
34. B
35. C
36. C
37. B
38. C
39. A
40. A
41. A
42. A
43. B
44. C
45. A
46. C
47. C
48. B
49. C
50. A
51. C
52. C
53. D
54. B
55. A
56. B
57. B
58. C
59. A
60. A