(2014年北京市西城区高三5月二模试题)28. It was unusual that such close neighbors ______ not know one another. 
#86401
A
could
B
would
C
must
D
should
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——I wish they        always late.
#86391
A
weren’t
B
hadn’t been
C
wouldn’t be
D
wouldn’t have been
It ____ be our headmaster. He has gone to Beijing.
#88070
A
mustn’t
B
won’t
C
may not
D
can’t
Let’s clean our classroom, _____?
#90126
A
will you
B
don’t we
C
shall we
D
do you