练习：

　　1.______ is a good form of exercise for both young and old.

　　A. the work B. walking C. to walking D. walk

　　2. How about the two of us ____a walk down the garden?

　　A. to take B. take C. taking D. to be taking

　　3. –I must apologize for ____ahead of time.

　　-That’s all right.

　　A. letting you not know

　　B. not letting you know

　　c. letting you know not

　　D. letting not you know

　　4. -You were brave enough to raise objections at the meeting.

　　-Well, now I regret ____that.

　　A. to do B. to be doing

　　C. to have done D. having done

　　5. –what do you think made Mary so upset?

　　-___her new bicycle.

　　A. as she lost B. lost C. losing D. because of losing

　　1-5 BCBDC

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