Câu trả lời:
1. B. need
2. C. undergoes
3. B. is
4. C. will have
5. D. to concentrate
6. C. idea
7. A. maintain
8. B. saying
9. C. staple
10. C. convenient
11. D. vast
12. B. Japan
13. C. means
14. A. weaving
15. D. tongue
16. A. native
17. C. Shaking
18. B. practice
19. C. impact
20. A. improve