Researches are convinced ______ the positive effect of laughter ______ physical and mental health.
#26134
A
of; at
B
by; in
C
of; on
D
at; on
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He divided the sweets ____the children who were divided____ four groups.
#27194
A
in, in
B
into; into
C
between; in
D
among; into
The form cannot be signed by anyone ______ yourself. 
#26443
A
rather than
B
better than
C
more than
D
other than