Let’s clean the classroom, _______? 
#89877
A
won’t you
B
shall we
C
do we
D
will not you
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 It was Mr. Zhang that helped us out of the trouble. Without his help, we ______ it so easily.
#86786
A
can’t manage
B
mustn’t have managed
C
couldn’t have managed
D
couldn’t manage
The book I bought from the bookstore isn’t here. Who __________?
#89207
A
could have taken it
B
must have taken it
C
might take it
D
should take it.
They didn’t attend the discussion, although they _________.
#87947
A
should
B
would have to
C
should have to
D
should have