6. Solar panels ________ to produce electricity.

A. used             B. are used       C. uses

3. The man ________ car is parked outside is my uncle.

A. who             B. which           C. whose

8. You should remember ________ off your computer when you finish using it.

A. turn              B. to turn          C. turning

15. I don't mind ________ to school.

A. walking       B. to walk         C. to walking

16. You had better ________ on a coat.

A. to put           B. put               C. putting

13. He intends ________ abroad when he finishes school.

A. study            B. to study        C. studying

12. Jeff can’t stand ________ to rock music.

A. to listen       B. listen            C. listening