—Jack is not in the office at the moment—Oh, he ______ those who are going to take the driving test in an hour.
#62546
A
can have instructed
B
must have instructed
C
must be instructing
D
will be instructing
 I ________ have watched that movie---it will give me horrible dreams.
#62547
A
shouldn’t
B
needn’t
C
couldn’t
D
mustn’t
Tom ____ be ill, for I saw him playing basketball an hour ago. 
#62553
A
mustn’t
B
needn’t
C
can’t
D
may not
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