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Over the past decades, sea ice in the Arctic as a result of global warming. A. had decreased B. decreased C. has been decreasing D. is decreasing
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During the period of recent terrorist activities, people _______ not to touch any unattended bag. A. had always been warned B. were always being warned C. are always warning D. always warned
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Mary went to the box office at lunch time, but all the tickets ______ out. A. would sell B. had sold C. have sold D. was selling
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This is the first time we______ a film in the cinema together as a family. A. see B. had seen C. saw D. have seen
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My parents _____ in Hong Kong. They were born there and have never lived anywhere else. A. live B. lived C. were living D. will live
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I was out of town at the time, so I don’t know exactly how it _______. A. was happening B. happened C. happens D. has happened
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Progress ______ so far very good and we sure that the work will be finished on time. A. was B. had been C. has been D. will be
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Edward, you play so well. But I you played the piano. A. didn’t know B. hadn’t known C. don’t know D. haven’t known
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His sister left home in 1998, and since. A. had not been heard of B. has not been heard of C. had not heard of D. has not heard of
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My parents have promised to come to see me before I for Africa. A. have left B. leave C. left D. will leave
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