NHANH CẦN GẤP đọc và chọn đáp án đúng people need to breathe.if they don't breathe,they __1___die.but how clean is the air people breathe? if they breathe__2__air, they will have breathing problems and become ill. plants and animals need__3__too. a lot of the things__4__our lives create harmful gase and make the air dirty, like cars, motorbikes and factories. dirty air is called__5___air. air pollution can also make our earth warmer. the problem of air pollution started with the burning of coal in homes and factories 1. A. are B. were C. will D. must 2. A. dirty B.clean C. fresh D. good 3. A safe B clean C dirty D polluted 4. A at B on C in D to 5. A polluted B pollute C polluting D pollution