III. Complete the passage with the words given. (1.5 ms)
harmful breathing pollution motorbikes need clean |
People need to breathe. If they don’t breathe, they will die. But how (1) ________is the air people breathe? If they breathe dirty air, they will have (2) _________________ problems. Plants and animals (3) ________________ clean air too. A lot of the things in our lives create (4) ______________ gases and make the air dirty, like cars, (5) ______________, and factories. Dirty air is called “polluted air”. Air (6) ________________ can also make our Earth warmer.