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21.Children’s brains can not develop ____ they lack protein(蛋白质).
A. since B. when C. because D. unless
22. Persons with whom we can _____our innermost feelings are our closest friends.
A. tell B. share C. value D. respect
23. Without facts, we can’t form a correct opinion, for we need to have actual knowledge ____ our thinking.
A. which to be based on B. which to base on
C. on which to base D. which to base
24.Nearly all the trees have seeds that fall to the ground, ____ and eventually produce new seeds.
A. taking root B. take root C. took root D. to take root
25.－Are you in a hurry?
－No, in fact, I have got plenty of time. I_____ wait.
A. must B. can C. may D. should
26.－Could you lend me that book you____ me about when I telephone you?
－No, I’m sorry, I can’t. I gave it to a friend.
A. were telling B. would tell C. had told D. had been telling
27.The news was a terrible blow to her, but she will ____ the shock soon.
A. get out B. get through C. get off D. get over
28.Actually, girls can be ____ they want to be just like boys, whether it is a pilot, an astronaut, or a general manager. A. wherever B. however C. whatever D. whoever
29. ____ he met with difficulties did he realize the importance of our help.
A. Even though B. Never until C. Only before D. Ever since
30.－That’s me when I graduated from college. See what I look like now!
－Why not take up exercise to improve your ______.
A. look B. form C. shadow D. figure
31. It is in Qingdao. you' re going to pay a visit to this kind of washing machine is produced.
A. 不填；that B. where; which C. 不填; where D.
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