Viết phương trình phân tử ,ion và ion rút gọn của các phảng ứng dau nếu có

tính giá trị biểu thức A= 1+2+3+...+2007

Calli: Người ta nói tình euu khong quan trọng đẹp hay xấu :) Vậy toi xấu sao khonq euu toi :)?

Viết một bài văn khoảng 400 chữ kể lại một truyện cổ tích

làm cách nào viết một bài văn ngắn nhưng vẫn được điểm cao

32. I quite agree with you that happiness cannot buy. A. quite B. with C. happiness D. buy 29. Franklin D. Roosevelt became president of the United States in 1933 and has reelected three times before he died in 1945. A. president B. the United States C. has reelected D. times Tìm lỗi sai 14. America, as well as Japan, Britain^ France and Germany, ………………. , A. are developed countries B. are developing countries C. is a developed country D. is a developing country

Hiện nay tuổi mẹ gấp 5 lần tuổi con. Đến khi tuổi con bằng tuổi mẹ hiện nay thì tổng số tuổi của hai mẹ con là 84 tuổi. Tính tuổi mẹ và tuổi con hiện

EXERCISE 2: Use the correct form of verbs in brackets. 1. In all the world, there (be) __________ only 14 mountains that (reach) __________above 8,000 meters. 2. He sometimes (come) __________ to see his parents. 3. When I (come) __________, she (leave) __________for Dalat ten minutes ago. 4. My grandfather never (fly) __________ in an airplane, and he has no intention of ever doing so. 5. We just (decide) __________ that we (undertake) ____________ the job. 6. He told me that he (take) __________ a trip to California the following week. 7. I knew that this road (be) __________ too narrow. 8. Right now I (attend) __________ class. Yesterday at this time I (attend) __________class. 9. Tomorrow I'm going to leave for home. When I (arrive) __________at the airport, Mary (wait) __________ for me. 10. Margaret was born in 1950. By last year, she (live) __________on this earth for 55 years . 11. The traffic was very heavy. By the time I (get) __________to Mary's party, everyone already (arrive) __________ 12. I will graduate in June. I (see) __________ you in July. By the time I (see) __________ you , I (graduate) __________. 13. I (visit) __________ my uncle's home regularly when I (be) __________ a child. 14. That book (be) ________ on the table for weeks. You (not read) _______ it yet ? 15. David (wash) __________ his hands. He just (repair) __________ the TV set. 16. You (be) __________here before? Yes, I (spend) __________ my holidays here last year. 17. We never (meet) _________ him. We don't know what he (look) _________like. 18. The car (be) __________ ready for him by the time he (come) __________tomorrow. 19. On arriving at home I (find) __________that she just (leave) __________a few minutes before. 20. When we (arrive) __________ in London tonight, it probably (rain) __________. 21. It (rain) __________ hard. We can't do anything until it (stop) __________ 22. Last night we (watch) __________TV when the power (fail) __________. 23. That evening we (stay) __________up to talk about the town where he (live) __________for some years. 24. I (sit) __________down for a rest while the shoes (repair) __________. 25. Half way to the office Paul (turn) __________round and (go) __________back home because he (forget) __________to turn the gas off. 26. London (change) __________a lot since we first (come) _________ to live here. 27. While we (talk) __________on the phone the children (start) __________fighting and (break) __________a window 28. He used to talk to us for hours about all the interesting things he (do) __________ in his life. 29. You know she (stand) __________looking at that picture for the last twenty minutes. 30. I (spend) __________ a lot of time travelling since I (get) ________this new job. 31. When we (be) __________ at school we all (study) __________Latin. 32. When I (meet) __________ him , he (work) __________as a waiter for a year. 33. After he (finish) __________ breakfast he (sit) __________down to write some letters. 34. She (have) __________a hard life, but she's always smiling. 35. I think Jim (be) __________ out of town.

Viết tiếp vào chỗ chấm để so sánh hai số thập phân (theo mẫu): Mẫu: 29,78, < 31,02 (vì 29 < 31) a) 54,7 ... 54,69 (vì....) b) 0,6 ... 0,56 (vì....)

complete the second sentence so that it means the sames as the first