Part 3: Read and choose the correct answer for each of the blanks: Plants and animals need (1) ......... air to breathe. A lot of the things in our lives create urmful gases and (2) ......... the air dirty, like cars, motorbikes and factories. Dirty air is called " air Air pollution can also (4) .. .our Earth warmer. The problem of air pollution started with burning (5) ......... coal in homes and factories. 1. A safe B. dirty C. Clean D light 2. A. Make B. Give C. Get D. take 3. A. Pollute B. pulluted C. polluting D. pollution 4. A. to make B. making C. Made D. make 5. A. In B. of C. for D. on