Choose the correct word marked A, B, or C to fill each blank in the following passage.
AIR QUALITY
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 (3)_______. Plants and animals need clean air too. A lot of the things in our lives create harmful gases and (4)______ 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.
If they don’t breathe, they (1)______ die.
If they breathe (2)______ air, they will have breathing problems
and become (3)_______.
A lot of the things in our lives create harmful gases and (4)______ the air dirty, like cars, motorbikes and factories.
Dirty air is called “(5)_______ air”.
