: Chia các động từ ở thì quá khứ đơn hoặc quá khứ tiếp diễn. 1. When my uncle (come)_______________, we (water) _______________ the plants and flowers in the garden. 2. Thu (talk) _________________ to her friend, Hoa, on the phone at 8 o’clock last night. 3. Lan (practise) _________________ the piano while her sister (read)_____________ comics at 7 o’clock last night 4. The monkeys (climb) _________________ up the trees when we (visit)___________ to zoo yesterday morning. 5. Ba (talk) ________________ with his classmate when the principal (enter) ________________ their classroom. 6. Last night I (make)__________ a cake when the lights (go)____________ out. 7. While I (cross)____________ the street, I (step)____________ on a banana skin and (fall)_____________ heavily. 8. It (begin) _________________ to rain when I (plant) ________________ some flowers in the garden. 9. When I (arrive)_____________, the teacher (write) _________________ on the blackboard. 10.When they (walk)______________ down the stairs, they (hear) _________________ a strange noise