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
推荐题目
He left ________any of his friends _________ him _________.
#26830
A
with; seeing; of
B
without; seeing; off
C
without; see; /
D
with; see; out
I met this guy _____ some other occasions but he did not seem to recognize me.
#27401
A
for
B
on
C
at
D
in
