Choose the correct answer.

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).

Choose the correct answer.

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

Mary: _____________.

Choose the correct answer.

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

Choose the correct answer.

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

Choose the correct answer.

A rare _______ is now killing many farm animals in the countryside.

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

Choose the correct answer.

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