Scientists are convinced ________ the positive effect of laughter ________ physical and mental health.
#25675
A
of; at
B
on; at
C
by; in
D
of; on
推荐题目
At the railway station, the mother waved goodbye to her daughter until the train was _______.
#28247
A
out of sight
B
out of reach
C
out of order
D
out of place
— These boxes are too heavy for me to carry. — Here, I’ll give you a hand ________ them.
#28826
A
for
B
to
C
with
D
by
His money had not brought happiness and perhaps it had contributed________ his strange sense of values.
#27550
A
up
B
for
C
as
D
to