The violin will have to be tuned before it _____.
A. is played
B. should play
C. plays
D. is being played
By the time you arrive in London, we _____ in Europe for two weeks.
A. had stayed
B. shall stay
C. will have stayed
D. have been staying
I ___ with some friends until I find a flat.
A. am living
B. live
C. have lived
D. will have lived
I thought I ____ the door, but it is still open．
A. had closed
B. was closing
C. have closed
D. would close
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