11. The train to Ha Noi ________ at 7 a.m tomorrow. A. leaves B. leaving C. to leave D. left 12. Environmental pollution has ________ lots of health problems. A. caused B. got C. made D. led 13. The heavy rain has caused ________ in many parts of the country. A. drought B. storms C. forest fire D. floods 14. The road in front of my office is always ________ when it rains heavily. A. to flood B. flooded C. flood D. flooding 15. Singapore is famous for its ________ and green trees. A. clean B. cleanly C. cleaning D. cleanliness 16. Don’t drink that water. It’s ________. A. damaged B. d¬¬umped C. contaminated D. contamination 17. New Zealand is famous for the ________ beauty of its mountains and forests. A. flag B. scenic C. money D. banner 18. Do you know what ________ cause air pollution? A. pollutants B. contamination C. death D. damage 19. The acid rain has caused ________ to the trees in this area. A. carefulness B. damage C. attraction D. difficulty 20. Rivers are one of the world’s most important natural _________. A. resources B. goods C. possessions D. materials 21. The ______buried the whole village while people were still sleeping in their houses. A. drought B. flood C. mudslide D. tornado 22. If people ________ to work by bus, there ________ fewer car fumes. A. to travel/ be B. travel/ are C. will travel/ be D. travel/ will be 23. If people didn’t throw rubbish in the street, it ________ attractive. A. will look B. would look C. look D. to look 24. There are about 750 million English speakers in the world, and this number _____ fast. A. is increasing B. to increase C. are increasing D. increase 25. In the future, natural disasters ________ accurately with the help of technology. A. to predict B. predict C. will be predicted D. will predict