Scientists are convinced the positive effect of laughter physical and mental health. [ ——青夏教育精英家教网——

Scientists are convinced _____ the positive effect of laughter _____ physical and mental health.

[ ]

A. of; at
B. by; in
C. of; on
D. on; at

Experts have been warning _____ of the health risks caused by passive smoking

A. at a time
B. at one time
C. for some time
D. for the time

I have offered to paint the house ____ a week's accommodation.

A. in exchange for
B. with regard to
C. by means of
D. in place of

Some people choose jobs for other reasons _____ money these days.

A. for
B. except
C. besides
D. with

If you are too formal, people around you won't be _____.

A. at ease
B. in danger
C. in common
D. at work

As a solder, you should defend your country _____ the enemies.

A. to
B. against
C. in
D. with

_____ fire, all exits must be kept clear.

A. In place of
B. Instead of
C. In case of
D. In spite of

— I think he is taking an active part in social work.
— I agree with you _____.

[ ]

A. in a way
B. on the way
C. by the way
D. in the way

Many Chinese universities provided scholarships for students ______ financial aid.

A. in favour of
B. in honour of
C. in face of
D. in need of

At the railway station, the mother waved goodbye to her daughter until the train was _______.

A. out of sight
B. out of reach
C. out of order
D. out of place

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