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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Measures have been taken to fight ________recurring food safety problems, but there is still a long way to go before China can rid itself ________ these issues.
#25217
A
for; of
B
for; from
C
against; of
D
against; from
Tom is good boy and _______ he is honest. He never tells a lie.
#27715
A
at all
B
in all
C
above all
D
after all
Mr Smith sold that magnificent cottage of his on the sea ________ 2,000,000 dollars.
#28568
A
at
B
for
C
to
D
by
This football player was accused of taking money for not scoring goals ______.
#26961
A
by chance
B
on end
C
in turn
D
on purpose