You___leave your key at the reception desk.
A. may
B. was able to
C. should
D. would
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A computer can't think itself, it___ be told what to do.
A. may
B. able to
C. must
D. would
The question is whether we____act on his advice.
A. should
B. was able to
C. ought to
D. both A and C
Hurry up. He___be waiting for us anxiously right now.
A. must
B. was able to
C. could
D. would
My MP 5 has disappeared, who ___ have taken it?
A. may
B. can
C. could
D. both B and C