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Passage

Smoking, which may be a pleasure for some people, is a serious source of discomfort for their fellows. Medical authorities express their 21about the effect of smoking on the health not only 22those who smoke but also of those who do not. In fact, nonsmokers who must involuntarily inhale the air polluted by the tobacco smoke may 23more than the smokers themselves.

As you are doubtless aware, a considerable number of our students have 24an effort to 25the university to ban smoking in the classrooms. I believe they are entirely right in their aim.

26, I would hope that it is possible to achieve this by 27on the smokers to use good judgment and show concern for others rather than 28 regulation.

Smoking is prohibited by city laws in theaters and in halls used for showing films as well as in laboratories 29there may be a fire hazard. Elsewhere, it is up to your good sense.

I am therefore asking you to maintain “No Smoking” in the auditoriums and classrooms. This will prove that you have to keep nonsmokers’ health and well-being 30, which is very important to a large number of our students.

21.

A. concern

B. trouble

C. interest

D. displeasure

22.

A. to

B. about

C. with

D. of

23.

A. endure

B. suffer

C. undergo

D. put up with

24.

A. joined

B. directed

C. joined in

D. directed at

25.

A. make

B. persuade

C. cause

D. tell

26.

A. But then

B. However

C. Further

D. Moreover

27.

A. pleading

B. begging

C. insisting

D. calling

28.

A. with

B. by

C. to

D. in

29.

A. which

B. when

C. where

D. in

30.

A. on mind

B. in heart

C. in mind

D. on heart