Scientists are convinced the positive effect of laughter physical and mental health.
#28244
A
of; at
B
by; in
C
of; on
D
on; at
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There are solid reasons for China to claim ownership of the Diaoyu Islands, which lie about 200 miles the eastern coast of our country.
#25516
A
to
B
on
C
off
D
of
The scientists are studying the effects of human activities______the environment.
#29004
A
in
B
at
C
on
D
with
The roads are lined _____trees, which have been planted to hold _____the strong winds from the north.
#28956
A
along; to
B
on; up
C
with; back
D
in; against