** Đáp án + Giải thích **
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Exercise 3: Put the verb in the past continuous tense.

1. I (go) ______________ down the street when it began to rain.
2. At this time last year, I (attend) ______________ an English course.
3. Jim (stand) ______________ under the tree when he heard an explosion.
4. The boy fell and hurt himself while he (ride) ______________ a bicycle.
5. When we met them last year, they (live) ______________ in Santiago.
6. The tourist lost his camera while he (walk) ______________ around the city.
7. The lorry (go) ______________ very fast when it hit our car.
8. While I (study) ______________ in my room, my roommate (have) ______________ a party in the other room.
9. Mary and I (leave) ______________ the house when the telephone rang.
10. We (sit) ______________ in the café when they saw us.