Giúp em với ạ em cảm ơn nhiều lắm ạ em đang cần gấp

Giúp em câu 16,18 với ạ Em cảm ơn nhiều ạ!!!

đêm nay em thức khuya chờ mọi người trả lời hộ em

Bài 3: Chia động từ cho đúng 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.

Describe an object which important to you (150 từ) Giúp em ạ!

Trên tia Ax lấy hai điểm B và C sao cho AB= 2cm AC= 3cm. Lấy điểm O ở ngoài đường thẳng chứa tia Ax. Vẽ các tia OA; OB; OC. Cho biết góc AOB= 80 độ, góc AOC 110 độ. Tính số đo góc BOC

Exercise 1. Choose the best answer to complete the following sentences. 21. If I ………..a camera, I would have taken some pictures. a. have b. had c. would have d. had had. 22. You won’t pass the examination……………you study more. a. as long as b. unless c. if d. whether. 23. If only I …………you wanted to invest money in business. a. had known b. knew c. have known d. know. 24. If I were to leave my country , I ……………disappointed. a. probably be b. would have been c. will be d. would be. 25. If he hadn’t wasted too much time, he…………….in his examination. a. would fail b. wouldn’t fail c. wouldn’t have failed. d. won’t fail. 26. If I had taken that English course, I ………..much progress. a. had made b. would have made c. made d. would make. 27. If I were in your place, I ……….a trip to England. a. will make b. had made c. made. d. would make. 28. If I ………….. you , I’d save some of your lottery winning. a. be b. were c. am d. was 29. If the car ……….. larger, we would have bought it. a. had been b. have been c. has been d. been 30. If I had enough money, I ……… abroad to improve my English. a. will go b. should go c. would go d. should have go to 31. If it …….. convenient, let’s go out for a drink tonight. a. be b. was c. were d. is 32. If you ……. time, please write to me. a. have b. have had c. had d. has 33. If you had the chance, ………… you go finishing? a. did b. would c. may d. do 34. Trees won’t grow ……….. there is enough water. a. if b. when c. unless d. as 35. If you ………. to my advice in the first place, you wouldn’t be in this mess right now. a. listen b. had listened c. will listen d. listened 36. I wish I …….. you some money for your rent, but I’m broke myself. a. can lend b. could lend c. would lend d. will lend 37. If someone ……… into the store, smile and say, “ May I help you?” a. comes b. came c. would come d. could lend 38. If you stay up late the previous night, you ………. sleepy the next morning. a. feel b. to feel c. feels d. will feel 39. If Peter ………., Sarah will be sad because she wants to meet him very much a. comes b. do not come c. does not come d. will come 40. If his teeth still …….., he will have to go to the dentist’s again. a. hurt b. hurts c. to hurt c. will hurt 41. If you…………Tom , tell him I have a message for him. a. will meet b. would meet c. meet d. met 42. If you …………too hot during the night , turn down the central heating.

phân tích đa thức thành nhân tử:phương pháp 2 (a+b)^3-c^3 125-(x+2)^3 (x+3)^3-8 x^6-1 X^6+1 (x-y)^3-(x+y)^3

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