It has been announced that students         remain in their seats until all the papers have been collected.
#63191
A
can
B
will
C
shall
D
may
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— Catherine, I have cleaned the room for you . — Thanks. You_______. I could manage it myself.
#63169
A
needn’t do
B
needn’t have done
C
mustn’t do
D
shouldn’t have done
It ___________last night, for the ground is wet outside.
#63212
A
would be raining
B
would have rained
C
must rain
D
must have rained
—_______ do you clean your room?— Every day. 
#77537
A
How long
B
How many
C
How often
D
How soon