14.-I hear that some power stations produce electricity ________ garbage.

-That’s true.

A. use burning　　　　 B. to burn　　　　　　　 C. for burning　　　　 D. by burning

13.-How can those cars work?

-People use nuclear power _______ them.

A. to run　　　　　　　　 B. running　　　　　　 C. to work　　　　　　 D. working

12.Some people like cats ________ some don’t like them.

A. while　　　　　　　　 B. but　　　　　　　　　 C. for　　　　　　　　　　 D. so

11.-Could you give me some advice on how to pass an exam?

-Sure. _______ you are, ______ mistakes you’ll make.

A. The more careful; the fewer　　　　　　 B. More carefully; fewer

C. The more carefully; the fewer　　　　　 D. The more careful; the less

10.-Maglev Train is very quiet, very fast and very clean in Japan.

-Yes, but it is a pity that it’s ________ expensive ________ use in the whole world.

A. too; to　　　　　　　 B. as; as　　　　　　　　 C. so; that　　　　　　　 D. not only; but also

9.-He’s always come to school ________.

-So he has.

A. in time　　　　　　　 B. on time　　　 　　　 C. at time　　　　　　　　　　 D. of time

8.-When you leave the classroom, you ought _______ the door.

-OK. I’ll remember to do that.

A. lock　　　　　　　　　 B. open　　　　　　　　 C. to open　　　　　　 D. to lock

7.-My watch is broken, _______ it doesn’t work.

-Bad luck!

A. and　　　　　　　　　 B. but　　　　　　　　　 C. so　　　　　　　　　　 D. or

6.-______ do you use paper towels?

-Seldom.

A. How soon　　　　　 B. How many　　　　 C. How long　　　　　 D. How often

5.-It’s best for us to _______ the lights when we leave a room.

-You’re right. It can save energy.

A. turn on　　　　　　　　　　 B. turn down　　　　 C. turn off　　　　　　 D. turn to