23. The air is badly polluted because some factories don’t _______the rules to protect the environment.

A. appreciate　　　　 B. regard　　　　　　 C.honour　 　　　　　D. respect

22.The agent was about to sign his name on the document_______, to our surprise, a stranger broke in to prevent him.

　 A.while　　　　　 B.when　　　　　　　 C.as　　　　　　 D.until

21.---I want a room for ten people to have a get--together.

　 ---Luckily there is one__________.

　 A. available　　　 B. qualified　　　　　 C. standard　　　 D. impressive

20.When the teacher came in, all the students pretended_______their homework.

　 A. to do　　　　　 B. doing　　　　　　 C. to be doing　　　　 D. done

19. Many countries are increasing their use of natural gas, wind and other forms of_______.

　 A. energy　　　　 B. source　　　　　　 C. power　　　　　　 D. force

18. Though they met for the first time, they talked______they were good friends.

　 A. even if　　 　　　 　　B. as if　　　　　　 C. even though　　　　 D. if only

17. Having walked in the desert for several days, we felt exhausted, but we had to find a pool before the water we had in the bottle________.　

A. ran out of　　　 B. ran away　　 　　　C. ran out　　　　　　 D. ran off

16. He always speaks ill of others and makes himself a bad ________ in public.

　 A. title　　　　　　　 B. name　　　　 C. example　　　　　 D. reputation

15.---Sorry I’m late again, but I got caught in the traffic jam.

　 ---Well, John, why not _______ a fresh story?

　 A. look up　　　　 B. take up　　　　　 C. pick up　　　　　　 D. make up

14.---Jim has his wife do all the housework! Isn’t he wise?

---Not really. He is _____.

　 A. more wiser and lazy　 B. wiser than lazy　 C. more lazy than wise　 D. lazier than wise