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to use a thing again is to __________.

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

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You shouldn’t use plastic bags to _____ food.

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

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___________ is destroying large areas of tropical rain forest.

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

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

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My brother and I will give last year’s clothes to ___________instead of throwing them away.

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If more people cycle, there will be less air ______.

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

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to make a new thing from an old thing is _______.

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

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If we all use _________bags, we’ll help the environment.

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We should give food for people _________ need to help them.

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