On AIDS Day, President Hu Jintao demanded that the problems _________ paid special attention to.
#87359
A
referred to being
B
referred to be
C
refer to being
D
refer to be
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Tony ____ the invitation, otherwise he would have attended your birthday party. 
#86508
A
couldn’t have received
B
mustn’t have received
C
needn’t have received
D
shouldn’t have received
One of the requirements for a fire is that the material _________ to its burning temperature.
#86705
A
is heated
B
be heated
C
would be heated
D
shall be heated