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

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

“Reduce, reuse, recycle” is said to encourage people to waste less, by using less and using things again, in order to _________the environment.

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

You shouldn’t use plastic bags to _____ food.

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

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

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

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

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

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

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

___________ is destroying large areas of tropical rain forest.

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

to cut down something is to _______.

To use a thing again is to __________.

 To gather more information, we need to do________.

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

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