Scientists are convinced       the positive effect of laughter_____physical and mental health.
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A
of, at
B
by, in
C
of, on
D
on, at
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 The hotel has been enlarged; ____, it’s service is improving.
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A
as a result
B
on the other hand
C
in addition
D
as well as
We should consider problems ________ others’ interests ________our own.
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A
according to;rather than
B
in term of;more than
C
in terms of;as well as
D
in place of;other than
 If you keep on, you’ll succeed _______.
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A
in time  
B
at one time
C
at the same time
D
on time