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21.The doctors _______ the medicines to the people in the flood area.

A. distributed

B.packed

C.prayed

D.undertook

22.Much of the news provided by this newspaper is _______, not foreign.

A. domestic

B.strain

C.purchase

D.murder

23.He tried to _______relations with his former wife but he failed.

A. measure

B.maintain

C.shelter

D.reply

24.He _______ to study harder in the future so that he could have more opportunities to find a better job.

A. resolved

B.resorted

C.requested

D.reserved

25.The _______ work continued for more than a week but there was still no sign of the missing boy.

A. research

B.rescue

C.vessel

D.vast

26.Many kinds of animals are believed to have _________ from the earth

A. withdrawn

B.vanished

C.found

D.hung

27.The engineers in this lab spent several weeks _______ their plans for the new bicycle.

A. counting

B.stripping

C.elaborating

D.casting

28.Pine trees are usually believed to _______ cold weather.

A. guard

B.accomplish

C.roar

D.endure

29.Free medical service is _______ to nearly all the college students in China.

A. favorite

B.available

C.convenient

D.average

30.After working for twenty hours without any rest, the doctors were _______.

A. exhausted

B.mounted

C.wrapped

D.restored

答案：

21.A 22.A 23.B 24.A 25.B

26.B 27.C 28.D 29.B 30.A