题目内容

It is no use ______ your past mistakes.

A. regretting
B. regret
C. to regret
D. regretted

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Her husband died in 1980 and had nothing to her,only her five children.

A. left;to leave
B. leaving;leaving
C. leaving;left
D. left;leaving

I am very busy.I have a very difficult problem ______ .

A. to work
B. to work out
C. to be worked out
D. to work it out

I would appreciate ______ back this affernoon.

A. you to call
B. you call
C. your calling
D. you’re calling

Climbing mountains was ,so we all felt .

A. tiring;tired
B. tired;tiring
C. tiring;tiring
D. tired;tired