We need to reduce air pollution so we ____ use public transportation. Don't waste electricity. ____ the lights, please. You ____ recycle paper, glass and plastic. You ____ throw your rubbish around. People ____ destroy forests. We ____ teach our children to protect the environment. We should plant ____ trees. We ____ the animals. People should use ____ water. They need to save water. To save energy, you ____ unplug the TV.

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