1) We (be) ______ happy if air pollution were the only problem. a) is b) are c) will be d) would be 2) If I travel to London, I (visit) _______ its museum. a) would visit b) visit c) visits d) will visit 3) They would be disappointed if you (not go) ______ to their party. a) didn't go b) don't go c) won't go d) go 4) If we (use) _____ this kind of light bulb, we will save energy. a) used b) use c) can use d) uses 5) If we recycle paper, we ______ (save) 1000 trees a day. a) saved b) will save c) would say d) will not save 6) If Jame _____(be) more outgoing, he would have more friends. a) was b) were c) be d) been 7) If the local people drink the contaminated water, they (have) …………….. health problems. a) have b) would have c) will have d) would have had 8) All the aquatic animals (die) …………….. if people don’t stop dumping sewage into the lake. a) would die b) will die c) died d) die 9) If the sun (shine) …………….., we will walk to the mountain. a) shines b) shine c) will shine d) would shine 10) If people (stop) …………….. digging the street, there wouldn’t be noise pollution in this area. a) stop b) stoped c) stopped d) stopping

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