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Scientists are convinced _____the positive effect of laughter _____physical and mental health．
#26778
A
of ;at
B
by; in
C
of ; on
D
on ;at
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I always wanted to do the job which I’d been trained ________.
#25245
A
on
B
for
C
by
D
of
More and more young people are fond ___ playing tennis nowadays.
#29031
A
on
B
to
C
in
D
of
Heavy smog blankets Beijing．        ,city authorities start using its new smog warning system．
#25216
A
In turn
B
In time
C
In response
D
In return
Totally _____ accident, the businessman got hold of a ten-pound fake banknote that was believed to ______ two hundred years ago.
#27594
A
by; have been issued
B
with; have come into use
C
in; have come out
D
at; have come into being
Make sure that the exercise you give the children is ________ pupil’s reach.
#27536
A
under
B
beyond
C
above
D
within