21. She refused to ____ the car keys to her husband until he had promised to wear hissafety belt.

　　A. hand in B. hand out C. hand down D. hand over

　　22. He doesn’t word but he gets a good ___ from his investments.

　　A. wage B. earning C. income D. salary

　　23. If he ___ to do this work, he might do it in some other way.

　　A. were B. was C. will D. can

　　24. I ____ here for four years, by next summer I shall have graduated.

　　A. shall study B. have studied

　　C. shall be studying D. have been studying

　　25. Mary learnt how to ____ a bicycle in her childhood.

　　A. open B. ride C. drive D. guide

　　26. Most part of the world is covered ___ water.

　　A. at B. in C. on D. with

　　27. We never understood the reason ____ he left us.

　　A. because B. why C. unless D. until

　　28. He broke the world ___ for the 100 meters.

　　A. mark B. level C. standard D. record

　　29. Diamond is ___ natural substance which is known.

　　A. hardest B. one of hardest C. harder D. the hardest

　　30. Since her blood pressure is much higher than it should be, her doctor insists that she __ smoke.

　　A. will not smoke B. should not smoke

　　C. not smoke D. Both B and

　　31.Studies have shown _______ teenagers often suffer form depression.

　　A.that B.which C.in which D.in that

　　32.The party has failed to _______ the majority of voters that it is capable of governing the country.

　　A.trust B.credit C.convince D.believe

　　33._______ driving around all day looking for somewhere to park, why don't you take a bus to town?

　　A.In spite of B.Rather than

　　C.In palce of D.Other than

　　34.The kids are _______ be hungry when they get home—they always are.

　　A. obliged to B. bound to C. desired to D. motivated to

　　35.All the characteristics that distinguish birds _______ other animals can be traced to prehistoric times.

　　A.to B.between C.for D.from