hoạt động của NST ở kì nào của giảm phân là cơ sở tạo ra sự đa dạng giao tử. Giải thích?

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I.Viết lại câu ko thay đổi nghĩa: 1) We began eating when it stard to rain =>We have....? 2) I last had my hair cut when I left her =>I haven't....? II.Đặt động từ trong ngoặc ở Quá Khứ Đơn hoặc Quá Khứ Hoàn Thành: 1) She said that she ( already, see )..........Dr. Rice 2) When he came to the stadium, the match ( already/begin ) 3) What ( be )..........he when he ( be )..........young? 4) No sooner ( have ).........I (watch)..........TV than the phone (ring)......... 5) I couldn't attend the evening class because I worked at night. =>If I ( not work )...........at night, I ( attend ).........the evening class. 6) I didn't have a laptop so I wish I ( have )........a laptop 7) You didn't stay home. I would rather you ( stay ).......home III.Đặt động từ trong ngoặc ở Quá Khứ Đơn, Quá Khứ Hoàn Thành hoặc Hiện Tại Hoàn Thành: 1) I suddenly ( remember )............that I...........( forget ) my keys 2) Bill no longer has his car. He ( sell ).......it 3) ( Have/you/put )...........of the fire before you ( go ).........out? 4) I was very pleased to see Mary again. I ( not see )..........for a long time 5) She said it ( be ).........the first time she ( meet )..........such a man IV.Viết lại câu nhưng vẫn đúng nghĩa: 1) David went home before we arrived =>When we................... =>After.......................... 2) We had snack than we had a look around the shops =>After.............. 3) The light failed the moment they began work =>They had no sooner................ =>No sooner................ =>Hardly............... 4) We had never been so happy before =>We were............. 5) I went to the zoo last year and that was where I saw a real tiger for the first time =>Before............... 6) I like you didn't go to the party yesterday =>I'd rather you.............. 7) The man was poor so he cuoldn't afford accommodation =>If........... 8) My teacher gave me a lot of homework =>I wish............... 9) He didn't obey with his parents =>I'd rather he.............. 10) She didn't take that job in the city because his home was very far from there =>If his home..................