We haven't settled the question of ______ it is necessary for him to study abroad.
#73178
A
if
B
where
C
whether
D
that
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The time of the last term , ________full use of ________the college entrance  examination , will be very important to every senior three student .
#68162
A
when made ; preparing for
B
if made; to prepare for
C
that made; to prepare for
D
whether is made; preparing for
I have two grammars, ______are of great use. 
#73806
A
all of which
B
either of which
C
both of that
D
both of which