It ____ be hot in the summer.
A. can
B. couldn’t
C. can’t
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–Who is the man over there? Is it Mr. Li?
A. No, it ______ be him. Mr. Li is much taller.
B. mustn’t
C. could not
D. can’t
--- Could I sit here?
A. -Yes, of course you _______.
B. can
C. could
D. must
It is lucky for him to _____ get the job.
A. be able to
B. could
C. can
I _____ promise you anything.
A. cannot
B. canot
C. could’not