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The scientists will explain some techniques on how to _______ household things.

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A lot of people _______ trash into rivers and make the water polluted.

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If I have time, I _______ some trees in my neighborhood.

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Jane: What about putting more trash cans on the streets?

Mary: _____________.

Find the mistake.

Governments worldwide (A) are working (B) together to protect (C) the environment for (D) pollution.

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One of the main _______ of water pollution is waste which is pumped into rivers, lakes and seas.

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People are using more and more _______-friendly products.

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We should take a bus often _______ we can help reduce air pollution in the city.