A. out
B. up to
C. down
D. after
Medical scientists __________ finding a cure for cancer since 1960s.A. have been working outB. have been workingC. have been working onD. have been building on
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The driver _________ slowly after the accident.A. came upB. came toC. came downD. came over
I have never been able to _________ down the magazine story.A. catchB. trailC. traceD. track
______ such a wonderful novel.A. Never have I before readB. Never have read I beforeC. Never before have I readD. Never had I before read
John and I have never been to thistown.A.tinyB.shortC.smallD.slight
She had to_______ the room after the Children’s party.A. clean outB. clean upC. clean downD. clean oil
The party _______ to be very successful.A. turned outB. turned onC. turned downD. turned off
