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If we use __________paper, we will save a lot of trees.

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 If people turn off all electric appliances in one hour all over the world, they can save lots of ___________.

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It is a good idea to _________our clothes with our friends or cousins.

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 “Why do you often forget to ______the lights when you go out of the classroom?”

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“Don’t throw rubbish into the river because you will make it ________________“

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If there is a rubbish bin in every class, the classroom will become ______.

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You should put the food in a reusable box __________plastic bags.

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If we ______waste paper, we will save a lot of trees.