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tế bào sinh dục gà có 2n=78 tế bào này nguyên phân 5 đợt liên tiếpvà giảm phân tạo ra các giao tửhãy tính số lượng NST đơn mới môi trường cung cấp cho tế bâò trên trong quá trình tạo giao tử và số giao tử được hình thành
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II, Complete the sentences using the past simple form of the verbs. 1. I (go)...........................to Nha Trang two years ago. 2. Ba (play)..................................football yesterday. 3. I ( eat) ..................................a lot of fish yesterday. 4. Her aunt (take)........................her to see Cham Temple last year. 5. Tuan ( have)................................a new bike yesterday. 6. She ( not buy).................................a new ruler yesterday.? 7. He ( not talk)................................with his parents about his vacation in Da Lat last year. 8.They ( not come)...................school yesterday? 9.The windows ( not close)...............................yesterday? 10. We ( not return)................................at home at 7 pm last Monday. 11.She ( not eat)..................................fish and crab yesterday. 12.Lan ( not go).................................Ho Chi Minh city two years ago. 13.My parents ( not take)..................................to Vung Tau last week. 14.We (not have)..................................a lot of friends in Ha Noi 15. Lan and Hoa (be)..............................at your school two years ogo? 16.What they ( play)................................last week? 17. What Hoa (try)..................................on yesterday? 18. Who (talk)............................................to about the film on TV last Monday? 19.Where they ( stop)..............................on their way back last Sunday? 20. What the student (wear) ...........................................at school two years ago?

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