It has been announced that candidates ______ remain in their seats until all the papers have been collected. 
#90070
A
can
B
will
C
may
D
shall
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He said that he would write to us but so far we ___________ from him.
#87738
A
didn’t hear
B
haven’t heard
C
shouldn’t have heard
D
hadn’t heard
The manager ______ the worker how to do it, or the accident couldn’t have happened.
#87803
A
couldn’t have told
B
ought to tell
C
could have told
D
mustn’t have told
I wish I_________ longer this morning, but I had to get up and come to class.
#86644
A
slept
B
had slept
C
might have slept
D
have slept