417. We must take some measures to control the pollution.

A. 　on

B. 　of

C. 　for

D. 　After

A. 　which

B. 　who

C. 　whose

D. 　what

A. 　what is the person over there.

B. 　who’s talking over there.

C. 　what are they doing.

D. 　which is that.

A. 　Speaking, please.

B. 　Oh, how are you?

C. 　I’m listening.

D. 　I’m Don.

A. 　who

B. 　which

C. 　whose

D. 　whom

A. 　must be

B. 　can be

C. 　would be

D. 　could be

A. 　Thank you for telling me

B. 　Oh, dear! I hope you＇ll get better soon

C. 　It isn＇t serious

D. 　It＇ll be better soon