If we . . . less paper, we . . . deforestation.
If we . . . hunters it’s wrong to kill animals, lots of animals . . . .
If we ... electric cars, we ... less air pollution.
If we ... special parks for animals, we ... lots of animals.
If people ... bicycles, the cities ... less polluted.
If the cities ... green areas, people ... more oxygen.
The children ... to play safely if the authorities ... more parks.
If the authorities ... public transport, people ... so many cars.
If people ... things, there ... so much rubbish everywhere.
If we ... people drink water they pollute, ... their behavior?
If we ... out forests, our environment ... much less polluted.
If we ... to cut out the forests, we ... less paper.
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