In those days, we had no phones, so we have to keep in touch _________ writing often.
#28930
A
with
B
of
C
on
D
by
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To build a harmonious society, we all have a part to play in the fight ____ injustice, unemployment and crime.
#25482
A
over
B
by
C
for
D
against
The computer system broke _____ suddenly while he was searching for information on the Internet．
#27119
A
down
B
out
C
up
D
in
______ having a busy schedule, Ariel Lin attended an environmental art exhibition.
#25885
A
Despite of
B
In spite of
C
Thanks to
D
Even though