Find the mistake.

My (A) uncle is one of the best (B) environmentalist (C) in (D) my country.

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.

Choose the correct answer.

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

Choose the correct answer.

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

Find the mistake.

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

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).