5. Sudden changes in water temperature can _____ the death of some fish and aquatic plants. A. come up B. lead to C. thanks to D. because of 6. _______ plastic take so long to break down, we should reduce the consumption of plastic products. A. Due to B. Although C. Even if D. Because 7. John was not keen on nature, _____ he was unhappy when his group went camping in a jungle. A. and B. so C. because D. but 8. Thousands of fish were killed _____ a discharge of poisonous chemicals from a nearby factory. A. because B. lead to C. result in D. as a result of 9. Carbon dioxide is a dangerous air ______. A. pollute B. effect B. pollutant D. cause 10. _________ is a sudden, violent shaking of the Earth’s surface. A. Tornado B. Drought C. Earthquake D. Flood 11. Rescue workers _________ the nearby village before the forest fire spread widely. A. evacuated B. took C. provided D. put out 12. Dozens of people were seriously _______ in the typhoon. A. injure B. injury C. injured D. injuries 13. People in countries like the USA, Great Britain use English as their _______ language. A. traditional B. official C. native D. foreign 14. The students are looking forward to _______ foreign friends in the summer camp. A. meet B. met C. meets D. meeting 15. There are about 750 million English speakers in the world, and this number ______ fast. A. increases B. increased C. is increasing D. increasing 16. Natural disaster can force people ______ their homes even though they don’t want. A. leaving B. left C. to leave D. leaves 17. Mount Sinabugn in Indonesia _______ two days ago. The lava destroyed everything in its path. A. exploded B. erupted C. went off D. came 18. The fire needs to be _____ right now, or else the whole forest will be burnt to ash. A. put on B. put off C. put out D. put up with 19. A: How about giving a report about the recent natural disaster in Europe. B: ____________ A. I don’t like it. B. That’s a good idea. C. There’s no point. D. I disagree. 20. A: The air in this area is dirty and I cannot stop sneezing. Achoo! B: ________ A. Bless you! B. I’m sorry C. What’s the matter? D. I don’t know.