用所给动词的正确形式填空。

1. —What_____ you_____(do) when he arrived?   —I ___________(watch) TV at that time.

2. When I___________ (walk) in the street, I__________ (meet) my best friend Jim.

3. Mum_________ (buy) my father a nice coat and a pair of trousers last Sunday.

4. While my parents were doing some cleaning, my sister_________ (shout) to me loudly.

5. When he saw the thief steeling things in the office, he closed the door and ________ (call) the police.

6. I first met my girl friend two years ago, she__________ (work) in the supermarket.

7. Thank you for_________ (teach) us so well, my dear teacher.

8. What________ your parents_________ (do) at nine o’clock last night?