Choose the correct answer.

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

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The Friends of the Beach is organizing a campaign to clean _______ the Front Beach.

If we _______ more trees, it will help reduce air pollution.

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

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We should clean up the beach _______ we should plant more trees along the coast.

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People are using more and more _______-friendly products.

Find the mistake.

If you don’t pay (A) attention, you will (B) understand (C) the lesson (D).

Find the mistake.

It is (A) too (B) hot today – please turn on (C) the air condition (D).