Find the mistake.

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

Choose the correct answer.

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

Choose the correct answer.

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

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

Find the mistake.

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

Choose the correct answer.

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

Choose the correct answer.

Burning coal to produce electricity _______ the air.

Find the mistake.

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