The number of traffic accidents that _______ in developing countries _______ increasing.
#86033
A
happen; is
B
happens; is
C
happens; are
D
happen; are
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The number of people who________ killed in the earthquake ______4000.
#85936
A
was; were
B
were; was
C
were; were
D
was; was
It is important  ______ students  ______ carefully in class .
#43797
A
for, listening.
B
of , listen
C
for, to listen
D
of , to listen.