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2 năm trước
Cho nửa đường tròn tâm O đường kính AB từ A,B kẻ tiếp tuyến Ax, By.Trên nửa đường tròn lấy điểm M bất kì kẻ tiếp tuyến với nửa đường tròn cắt Ax ,By lần lượt tại C và D a cm COD =90°.Tính AC.BC không đổi khi M di chuyển.Chứng mình M,O,B,D thuộc đường tròn mình
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81...............you................... (do) the homework yet? 182. It is very exciting.............................(see) that film. 183. Lan .......................... (see) this film three times. 184. We..............................(wait) you since two o’clock. 185 . My brother is good at...........................(fix) things. 186. May I .............................(go) out now , Mom? 187.We (not go) ............................to the cinema last week. 188. Mrs. Loan (teach)...........................us Math two years ago. 189.Last Sunday, Daisy (iron)..............................all her clothes. 190. She (do)...........................her homework recently. 191. I want (come)........................with my mother. 192. The doctor advised me(not smoke).......................cigarettes. 193. The boys stopped (play)....................football because of the rain. 194. Students have (wear)....................uniform when they go to school. 195. Mai’s mother told Mai (correct).........................the mistakes in her dictation. 196. This bike ( use )............................................................for six months. 197. I ( watch)......................... T V when the phone (ring)........................................ 198. Would you like ( take) ......................................a photo? 199. It is interesting ( study)..............................English. 200. Tom used ( like) ...................riding the bike when he ( be).................... a child. He (not drink)...............(some) ....... wine last year. He often (go) ............ out at night although he (use)........to stay home and (watch)............ TV at night. He (tell) ............ about (he).......... last night to us. There (be) ...........a TV set at his house 3 years ago. He (be) ........going ( buy) ........ a new ........... next month. 201. Mrs. Ha (like) .................... playing volleyball when she (be) ............ young. She prefers (look).................children playing volleyball together. 202. She never (allow)...... her students (go) ...... out. She (use) ..... think that children (ought)................ get up early in the morning and (go) ... to bed early ........... the evening . 203. The disease (spread).................fast now. Marconi (invent)...............the radio. The students must (be)................back by 5.30 p.m Nam (like)............. basketball. I hope (visit).................you in Hanoi soon. Why (be)................. Lan absent from school yesterday? I’d like (buy).................a new dictionary. Nga (receive).....................a letter two days ago. Yesterday, Mai(go)........... to the supermarket. Nam would like (tell)...............you about his family. Vegetables often (have).................dirt from the farm on them. Be careful, the children (cross)................ the street. Mai (be)...............15 years old next year. I (not watch).....................TV last night, he(read)...............a newspaper. You should (add).........a little salt. I (be).........very tired when (catch)............. a bad cold two day ago. You should (go)............to bed early. I hope you (feel).................better soon. All of students (wait)...................for the principle in the school yard now. Hoa (need)...............a lot of sugar. Ba (not come) ...................to the meeting last week. Nga never (take)................ medicines. 204. Mai lived in Hanoi last month, but now she (live)..................... Danang. Last week, she (go)...................shopping with her mother. She (buy).........................a lot of things there. Yesterday, She (had) ...................a small party at her house. She (invite) ........................... some new friends in her new school and the neighborhood. This morning, she (go)......................to her new school. And she (feel) ...................... very happy. She (think).......................that she (go) ..................... to school by bus because there is a bus stop near her house. 205. He (go) .......... to school when he was 14 years old. He (see) ........... Tom in a small house and they(write) .......... many stories in 1997. They (live) .......... there 3 months and (move) ........... to Hue . They (build) ............. a new house(live) ........ . They (work) ................. with deaf-mute and (invent) ......... a device (name) ............. phone. Now they ( live) ............. in a big house with modern equipments. Tom (watch)............. TV news every night (know)............. the world. They(be)...........proud......... themselves .

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