Cho đường tròn (O) có 2 đường kính AC và BD vuông góc với nhau. Một điểm M bất kì trên cung nhỏ AB, đường thẳng DM cắt AC ở E và cắt đường thẳng BC ở F A. Chứng minh: FE.MD=FC.AD B. M ở vị trí nào trên cung AB thì tâm đường tròn ngoại tiếp tam giác AME gần tâm O nhất Các bạn ơi giúp mình với mình cần lắm rồi

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Exercise : Fill in the blank with “a /an /the ) or ( x) (don’t need )”. 1. Are Jim and Alice ________cousins? ~ No, they aren't ________cousins; they are ________brother and ________sister. 2. ________fog was so thick that we couldn't see ________ side of ________road. We followed ________car in front of us and hoped that we were going ________right way. 3. I can't remember ________exact date of ________storm, but I know it was on ________Sunday because everybody was at ________church. On ________Monday ________post didn't come because ________roads were blocked by ________fallen trees. 4. Peter thinks that this is quite ________ cheap restaurant. 5. A: There's ________murder here. ~ B: Where's ________body?~ A: There isn't ________body. ~ B: Then how do you know there's been ________murder? 6. Number ________hundred and two, - ________house next door to us, is for sale. It's quite ________nice house with ________big rooms ________back windows look out on ________park. 7. I don't know what ________price ________owners are asking. But Dry and Rot are ________agents. You could give them ________ring and make them ________offer. 8. ________postman's little boy says that he'd rather be ________dentist than ________doctor, because ________dentists don't get called out at ________night. 9. Just as ________air hostess (there was only one on the plane) was handing me ________cup of ________coffee ________plane gave ________lurch and ________ coffee went all over ________person on ________other side of ________gangway. 10. There was ________collision between ________car and ________cyclist at ________ crossroads near ________my house early in ________morning. 11. Professor Jones, ________man who discovered ________new drug that everyone is talking about, refused to give ________press conference. 12. Peter Piper, ________student in ________ professor's college, asked him why he refused to talk to ________press. 13. Where is ......... hat that I bought yesterday? 14. Smith, ..........man you met yesterday, is ........... honest man. 15. .............. cheese, .............. butter, .......... iron and ................ milk are all substances. 16. ............. Alps are ............ highest mountain in ................ Europe. 17. He crossed ................ Atlantic in .............. record time. 18. It's .......... shame! There won't be another train for at least hour. 19. Stay in .......... hotel or ........... inn near ........... station. 20. ................ wool is one of .............. chief exports from ............. Australia. 21. I had ............. lunch with ............. old friend on ............... Saturday. 22. What ............... weather! ........... rain hasn't stopped all ...........day. 23. Out of .......... sight, out of .............. mind. 24. He collects .............. butterflies, ............. stamps and ................ match boxes.