It has been announced that candidates ( 候选人)_____remain in their seats until all the papers has  been  collected .   
#89832
A
can
B
will
C
may
D
shall
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—My cat’s really fat.—You _____ have given her so much food.  (浙江2007) 
#87470
A
wouldn’t
B
couldn’t
C
shouldn’t
D
mustn’t
The old lady insisted that her daughter ____ still alive and that she ____ at once. 
#87084
A
was; was operated
B
was; be operated
C
should be; should be operated
D
be; should be operated
 We ______ the difficulty together, but why didn’t you tell me?
#87353
A
should face
B
might face
C
could have faced
D
must have faced