I. Chia động từ ở thì quá khứ tiếp diễn
1.    I ___________________down the street when it begin to rain (go)
At this time last year, I ___________________an English course (attend)
Jim ________________ under the tree when he heard an explosion (stand)
The boy fell and hurt himself while he _________________ a bicycle (ride)
When we met them last year, they______________ in Santiago (live)
The tourist lost his camera while he________________ around the city (walk)
The lorry _______________ very fast when it hit our car (go)
While I ____________________in my room, my roommate ___________________ a party in the other room (study/have)
Mary and I___________________ the house when the telephone rang (just leave)
We __________________ in the café when they saw us (sit)