【題目】_________ that causes heavy haze sweeping over china remains unknown to many scientists.
A. what it is B. what is it
C. who is it D. who it is
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【題目】There are eight tips in Dr．Roger's lecture on sleep, and one of them is: to bed early unless you think it is necessary．
A. doesn't go B. not to go
C. don't go D. not going
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【題目】 As the Internet is expanding day by day, the opportunities for crime ______ as well.
A. has been B. is C. have been D. are
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【題目】The pianos in the other shop will be______，but______.
A. cheaper；not as better
B．more cheap；not as better
C．cheaper；not as good
D．more cheap；not as good
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【題目】－I have seen so little of Mike________. Is he away on business?
－Oh，no. He just leaves for his office early and comes back very________.
A. later；lately
B．later；later
C．lately；late
D．late；lately
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【題目】—Our uncle will be here to attend a meeting tomorrow, you know?
—Oh, I thought that he _____ today.
A. is coming B. comes
C. was coming D. will come
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【題目】 It’ll be another 50 years _________ China is expected to reach the level of a medium developed country.
A. since B. before C. that D. when
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【題目】All Mrs Smith's efforts to tidy the room were _____ because her grandson soon made a mess of it again.
A. at all costs B. at random
C. in vain D. in return
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【題目】Assistance dogs are trained to help disabled to live＿＿more independent life.
A. /; a B. a; the C. the; the D. the; a
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