I+ II/ 1. A 2. C 3. B 4. C 5. A
III/ 6. C 7. A 8. A 9. C 10. B 11. D 12. A 13. D 14. B 15. D
IV/ 16 .feeling 17. hedge 18. construction 19. tools 20. discovery
21. view 22. ritual 23. times 24. atmosphere 25. picture
V/ 26. won 27. didn’t 28. will take 29. don’t leave 30. had
VI/31. effects 32. participate 33. resources 34. eco-friendly 35. gases
VII/ 36. C 37. F 38. B 39. G 40. E
VIII/
41. It is cause by fumes emitted by cars, buses, trucks, trains, and factories, such as sulphur dioxide, carbon monoxide and nitrogen oxides.
42. Air pollution may cause lung cancer, asthma, allergies, and various breathing problems.
43. They are industrial acid rain, waste products, household wastes, and human activities such as bathing and cooking.
44. It includes aircraft noise, noise of cars, buses, and trucks, vehicle horns, loudspeakers, and industry noise, as well as high-intensity sonar effects.
45. It occurs when chemicals are released by spill or underground storage tank leakage which releases heavy contaminants into the soil.
IX/
46. Cambodia has unique ecosystems and impressive landscapes with 23 national protected areas.
47. Its abundant natural resources and rich biodiversity offer potential for ecotourism development.
48. There are over 60 rare species of wildlife in Cambodia, many of which are now extinct in Southeast Asia.
49. Ecotourism in Cambodia helps/is helping to protect wildlife, the natural environment and local cultures.
50. It also offer opportunities for employment and sustainable development to local communities.