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Tom saw a serious accident while he (stand) (a)   at the bus stop.

2. In 1417, Nguyen Trai (join) (a)   the army of Le Loi in the resistance movement in the mountainous regions.

3. We (drive) (a)   to the hospital to visit Mike when he called to say that he was fine.

4. They (be) (a)    in Hanoi on their summer vacation last month

5. Someone knocked at the door while theỵ (discuss) ………. the topic.

(a)  

6. Last night, when she (call) (a)   , I was doing homework.

7. It was a lovely day. The sun was shining and the birds (a)   (sing) in the trees.

8. The tourist lost his camera while he (a)   (walk) around the city.

9. I (a)   (walk) down the street when it began to rain.

10. At this time last year, I (a)   (attend) an English course.