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Giải thích các bước giải:
Chọn đáp án đúng nhất 1. When I last saw him, he _____ in London. A. has lived B. is living C. was living D. has been living 2. We _______ Dorothy since last Saturday. A. don't see B. haven't seen C. didn't see D. hadn't seen 3. The train ______ half an hour ago. A. has been leaving B. left C. has left D. had left 4. Jack ______ the door. A. has just painted B. paint C. will have painted D. painting 5. My sister ________ for you since yesterday. A. is looking B. was looking C. has been looking D. looked 6. I ______ Texas State University now. A. am attending B. attend C. was attending D. attended 7. He has been selling motorbikes ________. A. ten years ago B. since ten years C. for ten years ago D. for ten years 8. Christopher Columbus _______ American more than 500 years ago. A. discovered B. has discovered C. had discovered D. had been discovering 9. He fell down when he ______ towards the church. A. run B. runs C. was running D. had run 10. We _______ there when our father died. A. still lived B. lived still C. was still lived D. was still living 11. They ______ table tennis when their father comes back home. A. will play B. will be playing C. play D. would play 12. By Christmas, I _______ for Mr. Smith for six years. A. will have been working B. will work C. have been working D. will be working 13. I _______ in the room right now. A. am being B. was being C. have been being D. am 14. I ______ to New York three times this year. A. have been B. was C. were D. had been 15. I'll come and see you before I _______ for the States. A. leave B. will leave C. have left D. shall leave 16. The little girl asked what _______ to her friend. A. has happened B. happened C. had happened D. would have been happened 17. John ______ a book when I saw him. A. is reading B. read C. was reading D. reading 18. He said he _______ return later. A. will B. would C. can D. would be 19. Jack ________ the door. A. has just opened B. open C. have opened D. opening 20. I have been waiting for you ______. A. since early morning B. since 9 a. m C. for two hours D. All are correct 21. Almost everyone _______ for home by the time we arrived. A. leave B. left C. leaves D. had left 22. By the age of 25, he ______ two famous novels. A. wrote B. writes C. has written D. had written 23. When her husband was in the army, Mary ______ to him twice a week. A. was reading B. wrote C. was written D. had written 24. I couldn't cut the grass because the lawn mower ______ a few days previously. A. broke down B. has been broken C. had broken down D. breaks down 25. I have never played badminton before. This is the first time I _____ to play. A. try B. tried C. have tried D. am trying 26. Since _______, I have heard nothing from him. A. he had left B. he left C. he has left D. he was left 27. After I _______ lunch, I looked for my bag. A. had B. had had C. have has D. have had 28. By the end of next year, George _______ English for two years. A. will have learned B. will learn C. has learned D. would learn 29. The man got out of the car, ________ round to the back and opened the book. A. walking B. walked C. walks D. walk 30. Henry _______ into the restaurant when the writer was having dinner. A. was going B. went C. has gone D. did go 31. He will take the dog out for a walk as soon as he ______ dinner. A. finish B. finishes C. will finish D. finishing 32. I will be glad if he _______ with us. A. had gone B. did go C. went D. goes 33. Ask her to come and see me when she _______ her work. A. finish B. has finished C. finished D. finishing 34. Turn off the gas. Don't you see that the kettle ________? A. boil B. boils C. is boiling D. boiled 35. Tom and Mary ______ for Vietnam tomorrow. A. leave B. are leaving C. leaving D. are left 36. He always ________ for a walk in the evening. A. go B. is going C. goes D. going 37. Her brother ______ in Canada at present. A. working B. works C. is working D. work 38. I ______ to the same barber since last year. A. am going B. have been going C. go D. had gone 39. Her father ______ when she was a small girl. A. dies B. died C. has died D. had died 40. Last week, my professor promised that he ________ today. A. would come B. will come C. comes D. coming
Trong một buổi khỏe Phù Đổng , 204 học sinh lớp 5 xếp hàng như sau : đầu hàng là nữ , cứ 3 nữ đến 2 nam . Hỏi cần ít nhất mấy bạn nữ để bạn cuối hàng là nữ
Các Thiên tài về toán toánnnnnnn cho (p) y=x^2 và (d) y=2x+m^2-2m xác định m để d cắt p tại 2 điểm phân biệt có hoành độ lần lượt là x1,x2 thoả mãn x1^3+2x^2=3m GIÚP MÌNH ĐIIIiii
x^2 - 2(m-1)x - 3 = 0 Tìm m để /x1/ + /x2/ = 4
Sparky’s Adventure Farid was doing his best to steer clear of the movers until suddenly, he remembered his goldfish. “What about Sparky?” he asked. His parents stared at each other, open-mouthed, as his dad clapped his hand to his forehead. “Plenty of room for the fish,” the head mover offered. “You can’t be serious,” Mom said. “How can you get a goldfish from Lebanon to Detroit, Michigan?” “The same way as everything else: on the boat!” Six weeks later at the new house, a mover handed Sparky’s bowl to Farid. There was a letter too, with pictures. “Dear Farid,” the letter began, “I’ve had quite an adventure. First, I sailed on a small cargo ship from Lebanon to Spain. Here’s a picture of me and the captain. Then I moved to a large freighter that sailed from Spain to New York. Here’s a picture of me with the crew. Then I moved to a barge on the Hudson River. That took me through the Erie Canal to another small boat, which crossed Lake Erie to Detroit. Here’s that boat. Finally, a truck brought me to the door. Thanks for not forgetting me!” Đọc đoạn hội thoại trên và trả lời những câu hỏi sau: Where was the new house? What did a mover hand Farid along with Sparky’s bowl?
Cho phương trình ẩn x sau: (2x+m)(x-1)-2x^2 +mx+m-2=0. Tìm các giá trị của m để phương trình có nghiệm là một số không âm
The eruption of vocanoes is always _______. (disaster)
để trồng kín cỏ ở một sân vận động hai lớp 9a và 9b phải cùng nhau làm trong 5h 50 phút thì hoàn thành nếu làm riêng thì lớp 9a nhanh hơn lớp 9b 4 giờ biết khi làm cả 2 lớp trồng không nghỉ cho đến khi hoàn thành hỏi nếu làm riêng thì trong bao lâu xong GIÚP NHANH NHA MỌI NGƯỜI
Exercise: Rearrange the words to make sentences 1. finished/ your/ Have/ homework/ you/ yet? 2. did/ vacation/ not/ go/ We/ on/ a/ last year. 3. Dalat/ moved/ in/ My uncle/ to/ 2005. 4. did/ give up/ your father/ When/ smoking? 5. not read/ Jane/ from Mary/ has/ the letter/ yet. 6. Yesterday,/ how/ my/ to/ colleague/ to/ me/ explained/ use/ the printer. 7. I/ met/ school/ Ryan/ at/ this morning. 8. you/ visited/ in/ Have/ the elderly people/ the nursing home,/ James? 9. We/ to/ that village/ to do/ been/ volunteer work/ have/ several times. 10. We/ but/ doing/ started/ have not finished/ homework/ half an hour ago/ we/ it/ yet.
help pls giải bất phương trình sau :
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