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duymessi199
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cmr: nếu tia Ax có A trên (O) và tạo với dây AB góc BAx=1/2 số đo cung AB thì Ax là tiếp tuyến (O) tại A
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PRACTICE EXERCISE 1: 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. EXERCISE

1. Last year, there was a big typhoon in my area. It caused extensive damage to our.................. A. savings B. furniture C. property D. wealth 2. The victims of the roof of the houses ……………...with food and water by the rescue team. A. provided B. will be provide C. were provided D. had provided 3. By the time we got to the cinema, the film …………………... A. started B. starting C. starts D. had started 4. The…………..buried the whole village while people were sleeping in their houses. A.tornado B. drought C. mudslide D. thunderstorm 5. ...................workers were sent to the area immediately, but no villager was survived when the landslide happened A. help B. rescue C. volunteer D. assistance 6. Mi and Nick like ______________ back Mi’s home village on holiday. A. comes B. come C. came D. coming 7. If the factory ________________ dumping poison into the lake, all the fish and other aquatic animals will die. A. continues B. to continue C. continued D. will continue 8.Water ________________ in the lake has made the fish die. A. pollution B. pollute C. polluted D. polluting 9. If the air wasn’t dirty, I ________________ so much. A. wouldn’t sneeze B. sneeze C. would sneeze D. to sneeze 10. If the factory continues dumping poison into the lake, all the fish and other aquatic animals ________________. A. die B. to died C. dead D. will die

Mạng xã hội là một công cụ hữu ích của con người nhưng cũng có nhiều mặt tốt và mặt xấu.Cái tốt về nó có thể biết thông tin về xã hội và nhiều lĩnh vực khác có thể giúp cho chúng ta học hành và làm những công việc có ích khác nhưng không phải cái gì nó cũng có lợi. Học sinh xử dụng mạng xã hội quá nhiều, việc này nó rất có hại về mắt trước tiên, nó sẽ làm hại mắt khi sử dụng quá nhiều nó có thể gây ra việc cận mắt làm giảm thị lực từ đó sẽ xa sút việc học. Thứ hai, hs đăng quá nhiều thông tin lên mạng xã hội điều này có thể sẽ bị hacker xâm nhập đánh cắp dữ liệu về thông tin cá nhân từ đó có thể chúng sẽ tống tiền, hoặc chúng sẽ tiêm nhiễm bằng cách cho họ xem những hình ảnh nhạy cảm nếu không xem sẽ tung hết lên mạng. Thứ ba là khi chúng ta đăng một thứ gì đó nhưng không được người khác ủng hộ thì điều tất yếu sẽ xảy ra là công kích lẫn nhau nói tục chửi thề làm cho mạng xã hội mất đi tính đàng hoàng và có thể dẫn đến đánh nhau.Vì thế ta nên sd ít lại và dùng sao cho thật đúng cách đúng vói công dụng của nó TÌM GIÚP MIK CỤM CHỦ VỊ!!!!!!!!!!!

There are some unattended level crossings, with gates which road users have to open themselves, ‘Stop’ signs, and small red and green lights. Do not cross when the red light is showing, as a train is coming. There is a special railway telephone, and if you are driving a very large or slow moving vehicle, or are on foot with animals you must first telephone the nearest station to make sure it is safe for you to cross. Open both gates before you cross and close them after you. When you have crossed, telephone the station to let them know you are over. Some other unattended level crossings have gates but have no red lights. At such crossings, stop, look both ways, listen and make sure there is no train coming. If there is a special railway telephone, first telephone to make sure it is safe for you to cross. Before you cross with a vehicle or with animals, open the gates on both sides wide, and then check once again that no train is coming. Drive your vehicle or animals right across and well clear of the crossing and then close both gates. 28. All the level crossings described in the passage have …........................... A. flashing light B. attendants C. telephones D. gates 29. According to the instructions, you should cross level crossings ......................................… A. without hesitating B. as cautiously as possible C. in vehicle D. as far as possible from the car in front 30. You should never drive onto any level crossing if .......................… A. another vehicle is approaching B. the attendant has not operated the lights C. the exit is not clear D. a green light is flashing 31. At a crossing with gates you open yourself, you are told to telephone the station if …............ A. a red light is showing B. you are driving a very large vehicle C. your car breaks down close to it D. you have not closed the gates 32. Imagine you are going to drive across an unattended level crossing which has no lights at all. What is the final thing you must do before actually crossing? A. Open the near wide B. Look to see if a train is coming C. Telephone the nearest station D. Listen for any animals approaching

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