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 . plant and animal (3)................clean air too . a lot of the things in our lives create (4)..............gases and make the air city ,like car , (5)............., and factories . dirty air is called ''polluted air '' . air (6) ............can also make our earth warmer .
harmful , beathing, pollution , motorbike, need, clean