Ex 1. Chọn từ thích hợp cho những câu dưới đây. 1. He__________at school two days ago. A. isn't B. won't be C. wasn't 2. What time_________to bed last night? A. did you go B. do you go C. did you went 3. How_________your vacation in Hoi An last week? A. is B. was C. did 4. He________here yesterday. A. doesn't come B. didn't came C. didn't come 5. What________you________last Satuurday? A. do - do B. did - did C. did - do

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