If people ... after picnics, it ....... the environment.
We ... the use of natural resources if we ... old and used things.
If you ... the tap while brushing your teeth you ... too much water.
If you ... trees and flowers the air ... cleaner.
If people ... throwing rubbish into the rivers we ... clean water to drink.
The endangered animals ... if we ... the forests.
If we ... of our planet, the ice caps ... .
If we ... public transport more, the air in our cities ... cleaner.
If we ... electricity, we ... the environment.
If global warming ... to get worse, sea levels ... .
If you ... to help the environment, you should ... .
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