1. - Oh, dear. I forgot the air tickets.

- You ______ something.

A. have left B. are always leaving

C. are leaving D. always left

10. There __________ (be) a group round the fire when they __________ (reach) it. An old woman __________ (sit) on the ground near the kettle; two small children __________ (lie) near her; a donkey __________ (bend) his head over a tall girl.

9. It was quite late at night. George __________ (read) and Amy __________ (ply) her needle when they __________ (hear) a knock at the door.

8. Even when she ___________ (be) a child she ________________ (already, think) of becoming a ballerina (芭蕾舞演员).

7. As I __________ (walk) in the park, it __________ (begin) to rain.

6. While mother ________ (put) Cathy to bed, the door bell ________ (ring).

5. She __________ (not want) to stay in bed while the others ________________ (all, work) in the fields.

4. We __________ (test) the new machine when the electricity __________ (go) off.

3. Jim __________ (jump) on the bus as it __________ (move) away.

2. I __________ (telephone) a friend when Bob __________ (come) in.