Scientists are convinced______ the positive effect of laughter______ physical and mental health.
#26517
A
of ; at
B
by ; in
C
of ; on
D
on ; at
推荐题目
I’m writing this letter ________ my mother, who wants to thank you for your nice gift.
#27521
A
in order to
B
in behalf of
C
on behalf of
D
in terms of
Two-thirds of Australia kangaroos and ______ are native ______the area which_______ dry and desert.
#26726
A
dingoes; to, is
B
dingos; on, are
C
dingoes; to ,are
D
dingos; by, is
As we have much time left, let’s discuss the matter _______ tea and cake.
#28525
A
over
B
at
C
with
D
by