I saw Jack in the lift this morning. He around here for a long time.
A. won't be seen
B. wasn't seen
C. hasn't been seen
D. hadn't been seen
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Every means ______, but none proved ______.
A. have tried; a success
B. have been tried; successfully
C. has tried; to be successful
D. has been tried; successful
It's great that all the visitors who on the island were saved.
A. trapped
B. have been trapped
C. had trapped
D. had been trapped
A rescue worker risked his life saving two tourists who ________ in the mountains for two days.
A. are trapping
B. have been trapped
C. were trapping
D. had been trapped
The classroom ________ by students every day.
A. cleans
B. cleaned
C. is cleaned
D. is cleaning
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