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
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—The problem wasn’t difficult for him,was it?—No,it wasn’t.He      a more difficult one.
#89698
A
should have been given
B
ought to be given
C
would have been given
D
must be given
I could have called you for help, but I ____ your number.  
#90107
A
couldn’t remember
B
didn’t remember
C
should have remembered
D
hadn’t remembered