--- Where are the students ? How could they keep us waiting for so long? --- They started an hour ago and they____ be here in fifteen minutes, I think.
#90295
A
might
B
would
C
should
D
must
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—The problem wasn’t difficult for him,was it?—No,it wasn’t.He      a more difficult one.
#89698
A
should have been given
B
ought to be given
C
would have been given
D
must be given
I could have called you for help, but I ____ your number.  
#90107
A
couldn’t remember
B
didn’t remember
C
should have remembered
D
hadn’t remembered