—Artistic people_________be very difficult sometimes. —Well,you should know you married one.
#87957
A
can
B
might
C
could
D
must
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One thing’s for sure, the fire _____by some cigarette butts. 
#88084
A
might cause
B
could have caused
C
must have been caused
D
should be caused
I’m feeling sick. I __________so much chocolate.
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A
needn’t have eaten
B
couldn’t have eaten
C
mustn’t have eaten
D
shouldn’t have eaten
The teacher requested that they _____their homework on time.
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A
finished
B
could finish
C
finish
D
would finish