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vutranhanhngan
2 năm trước
Hoàn thành các sơ đồ lai sau: 1. P: AA x AA 2.P: AA x Aa 3.P: AA x aa 4. P: Aa x aa 5.P: AABB x AaBb 6. P: AaBb x aabb 7.P: Aabb x aaBb 8.P: AB/ab x ab/ab 9.P: Ab/aB x ab/ab 10.P: AB/ab x AB/ab
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Bài 2: Hiện tại hoàn thành và Quá khứ đơn 1.I………my Maths homework yesterday. (to do) 2………Susan………to England by plane? (to go) 3.They………a farm two weeks ago. (to visit) 4.Jenny and Peggy………their brother. (not/to help) 5.The children………at home last weekend. (not/to be) 6.When………you………this wonderful skirt? (to design) 7.My mother………into the van. (not/to crash) 8.The boys………the mudguards of their bicycles. (to take off) 9………you………your aunt last week? (to phone) 10.He………milk at school. (not/to drink) 11.The police………two people early this morning. (to arrest) 12.She………to Japan but now she………back. (to go – to come) 13.Dan………two tablets this year. (already/to buy) 14.How many games………so far this season? (your team/to win) 15……..the CN Tower when you………in Toronto? (you/to visit – to stay) 16……..your homework yet? – Yes, I………it an hour ago. (you/to do – to finish) 17.There………an accident in High Street, so we have to use King Street to get to your school. (to be) 18.I………Peter since I………last Tuesday. (not/to see – to arrive) 19.Frank………his bike last May. So he………it for 4 months. (to get – to have) 20.I’m sorry, I………earlier, but I………a lot lately. (not/to write – to work)

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