Choose the correct answer.

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

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

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).

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.

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.