Charlie ______ be really difficult at times even though he’s a nice person in general.
#63613
A
shall
B
should
C
can
D
must
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If you don't know the word, you can _____ in the dictionary. 
#75135
A
look it after
B
look at it
C
look for it
D
look it up
—I’m sorry. I         at you at the other day.— Forget it. I was a bit out of control myself.
#63326
A
shouldn’t shout
B
shouldn’t have shouted
C
mustn’t shout
D
mustn’t have shouted