c1 what would happen if water pollution didn't stop
c2 we would happy if air pollution in the world was a better place
c3 if there was not more pollution, the world would be a better place
c4 if I were you I would take these bottle in the bottle bank
c5 if people did not really care about the environment they would not try to save it
c6 the river would not be so polluted if factories didn't dump waste into it
c7 we would be less worried if oil spills weren't had such destructive effects
c8 if we destroyed the ozone layer what would save us in the UV rays
mình chưa chắc là đã đúng hết nhưng rất vui khi trả lời câu hỏi này