Choose the correct answer.

Polluted air can cause _______ problems in people and animals.

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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).

Find the mistake.

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

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

Mary: _____________.

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

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