EX 5 1.In order to keep our environment ……...…, we shouldn’t drop litter in public places. ( pollute) 2.If we go on ………………..the air, more people will suffer from respiratory diseases. ( pollution) 3.She is ……………….that I failed my exam. ( disappoint) 4/ She believes she finally find true …………………….. (happy) 5/ Although she is rich, she is ……………………. (happiness) 6/ He gave a ……………. description of their trip to Sapa. (humor) 7/ The Internet has ………………… developed nowadays. (increase) 8/ UFOs are just the ……………….. of some writers. (imagine) 9/ UFOs means ………………….. Flying Objects. (identify) 10/ The …………………. unit of currency is the Ringgit. (Malaysia) 11/ We’re worried about the ……………….. here. (pollute) 12/ This river is extremely …………………. (pollute) 13/ Air ……………….. makes us unhealthy. (pollute) 14/ The …………… of Vietnam has been effectively controlled. (populate) 15/ The town now becomes the Buddhist ………………. center of the whole country. religion) 16/ ………………., she manages to sell that motorbike at a high price. (surprise) 17/ Some people think that gods create ………………. eruption. (volcano) 18/ The volcanic………………. caused a lot of bad effects. (erupt)