13. B. polluted
14. C. countries
15. A. water
16. B. rivers
17. D. washed
18. D. carelessness
19. T
20. T
21. F
22. T
23. Tet is a joyful festival of the Vietnamese people.
24. He took part in many different charity activities
25. He is very humorous
26. I'm very proud of my father.
27. We often go to the cultural house
28. Thousands of people were disastrously killed in the morning
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