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21. the fifth generation computers， with artificial intelligence， _c_ and perfected now.
a） developed b have developed c are being developed d will have been developed
22. this ticket _c_ you to a free meal in our new restaurant.
a gives b grants c entitles d credits
a，b两项都要加双宾语，结构为：gives / grants sb. sth.
entitle sb. to sth. 使某人有权得到某物; credit a to b 相信a是由b造成的。
相信飞机失事是由飞行员错误造成的。 credit the crash to the pilot's mistake.
crash 坠落，坠毁（专指飞机失事）; collision 碰撞（强调两个物体碰撞，如火车、汽车等）。
we are sorry， very sorry， terribly sorry， awfully sorry.
23. you _d_ her in her office last friday; she's been out of town for two weeks.
a needn't have seen b must have seen
c might have seen d can't have seen
24. that was so serious a matter that i had no choice but _d_ the police.
a called in b calling in c call in d to call in
have no choice but to do sth. 别无选择，只能做。……
25. she was so _b_ in her job that she didn't hear anybody knocking at the door.
a attracted b absorbed c drawn d concentrated
be attracted by 被…所吸引; be absorbed in 全神贯注（专注）于做…
be drawn in 被诱骗（诱使）做。…… ; concentrate on 专注于。
i was simply drawn in. 我是被诱骗上钩的。
27. at first， the speaker was referring to the problem of pollution in the country， but halfway in her speech， she suddenly _b_ to another subject.
a committed b switched c favoured d transmitted
switch to another subject 转换话题; switch to another channel 转换频道。
28. it is politely requested by the hotel management that radios _c_ after 11 o'clock at night. [虚拟语气]
a were not played b not to play c not be played d did not play
29. although i like the appearance of the house， what really made me decide to buy it was the beautiful _d_ through the window.
a vision b look c picture d view
view n. 景色，风景，视野，视域。