One of the requirements for the fire is that the material ________ to its burning temperature. 
#89391
A
is heated
B
will be heated
C
would be heater
D
be heated
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 I would have come earlier, but I ________ that you were waiting for me. 
#89381
A
didn’t know
B
hadn’t know
C
would have known
D
haven’t known
The chief editor demanded  that  the  article ________immediately.
#87070
A
must be submitted
B
would be submitted
C
submits
D
be submitted
I can’t find the recorder in the room. It ________ by someone.
#87740
A
may take
B
may have been taken away
C
must have taken away
D
needn’t have been taken away