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1. C 2. B 3. B 4. A 5. D 6. A 7. C 8. D 9. C 10. B 11. A 12. A 13. B 14. C 15. C 16. A 17. B 18. C 19. D 20. A 21. C 22. D 23. F 24. T 25. F 26. T 27. B 28. C 29. preparation 30. experienced 31. beautify 32. Effective 33. assistance 34. successfully
35- Every one of us should follow the example set by Uncle Hồ, our beloved leader
36- Studying abroad gives students opportunities to learn about different cultures.
37. The children are keen on making models of animals in their free time.
38. If I were you, I would go to the dentist twice a year.
39. It has been two years since she (last) participated in a competition.
40. Because he performed well, he was nominated as Singer of The Year.