(   )28.-_____ you put away your books?-Yes, mum. I’ll do it at once.
#76655
A
Might
B
Should
C
Could
D
Must
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You look quite tired. You’d better _____a good rest.
#75778
A
stop to have
B
stop having
C
to stop to have
D
to stop having
Mary ______ my letter; otherwise she would have replied before now. 
#63420
A
has received
B
ought to have received
C
couldn’t have received
D
shouldn’t have received
You _____ have bought the book for me, but thank you all the same.
#62880
A
shouldn’t
B
needn’t
C
can’t
D
mustn’t