. Choose the correct answers.

1. The wind, the sun, and the wave are some types of……………..sources of energy.

A. changeable B. alternative C. cheap D. costly

2. Remember to……………the lights before going to bed.

A. turn B. turn on C. turn off D. stop

3. We should put…………….on our roof for the heating and hot water.

A. solar energy B. equipment C. cracks D. solar panels

4. Fossil fuels are very common in our society but they...……the environment.

A. renew B. provide C. waste D. pollute

5. Several governments try to………….the use of fossil fuels.

A. reduce B. increase C. waste D. save