It’s a rule in my class that our classroom ______ before 6:00 p.m. every day.
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A
be able to clean
B
should be cleaning
C
must clean
D
must be cleaned
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While he            the bus, he             a book.
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A
was waiting for, read
B
waited for, was reading
C
was waiting for, was reading
D
waited for, read
This kind of medicine ________in a dry and cool place。
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A
keep
B
kept
C
must keep
D
must be kept
The words that we should pay attention to ________on the blackboard.
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A
being written
B
are written
C
is writing
D
writing