___ I be free tomorrow, I could go with you.
A. Could
B. Should
C. Might
D. Must
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I wish I _______ there then.
A. was
B. were
C. had been
D. would be
It's time we _______ to bed.
A. must go
B. will go
C. went
D. have gone
If only I ______ my watch.
A. hadn't lost
B. haven't
C. didn't
D. don't
It is natural that he_____ so.
A. thinks
B. think
C. thought
D. will think