I. Put verbs in the past simple or present perfect tense: 1. We (study)............................................a very hard lesson the day before yesterday. 2. We (read)................................................almost every lesson in this book so far. 3. We (never / watch)..............................................that television program. 4. We (see)..................................an interesting program on television last night. 5. She (buy)…………………….......... a new car in 2011. 6. My wife and I (travel)................................................ to Mexico by air last summer. 7. Columbus (arrive)………………………..........in the New World in 1492. 8. I'm sorry, but I (not / finish)……………………….......... my homework 9. However, I (have)......................................... no trouble with my car since then. 10. I (lose)……………………...........my keys, so I can't open that door. 11. (you/ phone)…………………………..........your aunt last week? 12. (Dan / already/ buy) ……………………………….........two tablets this year. 13. How many games (you/ win)………………….…………………........... so far this season? 14. Peter (play) …………….…………......... football yesterday. 15. They (clean)…………………………….......... the car. It looks new again. 16. We (meet)………………………........... another country before. 17. This is the first time we (eat)………………………………….this food. 18. I (never / meet)…………………………………him before. 19. How long (she / live)…………………………………………….here? 20. We (work)………………………………………..there since we were 19 years old. 21. I (learn).............................................English last night. 22. I (learn)...........................................English for ten years. 23. She (read)..........................................the novel three times. 24. She (read)............................................the novel 2 weeks ago. 25. They (never / watch)............................................that film. 26. They (watch)........................................................that film on TV last night. 27. Where (you / go)................................................. to yesterday afternoon? 28. How long (you/ live)........................................................here? 29. We (do)..................................almost every lesson in this book so far. 30. However, I (have).....................................no trouble with my car since then.

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3 tế bào sinh tinh có kiểu genAb/aBDd gp bình thường hỏi tạo ra tối đa bao nhiêu loại giao tử

Cho hình lăng trụ đứng ABC.A'B'C' có đáy ABC,A'B'C' là tam giác đều, AA'=6a. M,P lần lượt là trung điểm AA',CC'. B'N=2BN. Tính ((MNP),(ABC))=? Dùng $cos∝=\frac{S_{ABC} }{S_{MNP}}$

Giúp em câu 4.5, 4.6, 4.7, 4.8, 4.9, 4.10, 4.11 với ạ

9/2.4 + 25/4.6 + 49/6.8 +..+10201/100.102 giúp em với ạaaaaaaaaaaaaaaaa

Ex1: Give the correct form of verbs in present simple 1. Jo is so smart that she(pass)..................... every exam without even trying 2. My life (be) so boring. I just (watch)........................... TV every night 3. My best friend (write)...................... to me every week 4. You (speak)...........................English? 5. She (not live)........................ in HaiPhong city 6. When father .....................(come back),will we go out? 7. My mother..........................(prepare,usually) break fast at 10 a.m 8. Every morning ,Mark.........................(drive) his children to school 9. I ...................... (not,speak) Italian when I'm at school 10. .......................(like,you) drinking coffee? giup minh voiii

CHO X,Y DƯƠNG TÌM MIN: `A=16(x^4+y^4)+1/(4xy)` VV NHA AE KO CẦN GẤP GÁP - CHÍNH XÁC

1. Trong R3, tập hợp nào trong các tập sau độc lập tuyến tính? A. (0;0;0), (1; 2;3), (4;1; 2)    B. (1; 1;2), (1; 2;3), (4;1; 2), (2;4;2)     C. (1;1; 2), (1; 2;3), ( 1; 1;3)      D. (1;1; 2), (1; 2;3), ( 1; 1;2)     

viết kết quả theo kiểu:Đ, S, S, S, S nha