Giúp mình 3 câu này thôi ạ, xin mời cía thiên tài toán

Choose the best answer by circling its corresponding letter A, B, C or D. 1. The children felt__________when their mother was coming back home. A. excitement B. excitedly C. excited D. exciting 2. What would you do if you__________me? A. are B. have been C. were D. will be 3. A country which exports a lot of rice is called a(n)__________country. A. rice-export B. exporting-rice C. export-rice D. rice-exporting 4. Mr Smith doesn’t go out in the evening, __________? A. do they B. don’t they C. doesn’t he D. does he 5. Some people are used to ___________in crowded buses and don't mind it at all. A. riding B. ride C. rode D. to ride

Bài 5: Chọn đáp án đúng để điền vào chỗ trống 1. If I __________the same problem you had as a child, I might not have succeeded in life as well as you have. a. have B. would have C. had had D. should have 2. I __________you sooner had someone told me you were in the hospital. a. would have visited B. visited C. had visited D. visit 3. __________more help, I would call my neighbor. a. needed B. should I need C. I have needed D. I should need 4. __________then what I know yesterday, I would have saved myself a lot of time and trouble over the years. a. had I known B. did I know C. If I know D. If I would know 5. Do you think there would be less conflict in the world if all people __________the same language? a. spoke B. speak C. had spoken D. will speak 6. If you can give me one good reason for your acting like this, __________this incident again. a. I will never mention B. I never mention c. will I never mention D. I don’t mention 7. If I had known you were asleep, I __________so much noise when I came in. a. didn’t make B. wouldn’t have made c. won’t make D. don’t make 8. Unless you __________all of my questions, I can’t do anything to help you. a. answered B. answer C. would answer D. are answering 9. Had you told me that this was going to happen, I __________it. a. would have never believed B. don’t believe c. hadn’t believed D. can’t believe 10. If Jake __________to go on the trip, would you have gone? a. doesn’t agree B. didn’t agree C. hadn’t agreed D. wouldn’t agree 11. J: “John went to the hospital alone”, K: “If __________,I would have gone with him”. a. had he told me B. he had told me C. he has told me D. he would tell me 12. If you __________, I would have brought my friends over to your house yesterday to watch T.V, but I didn’t want to bother you. a. had studied B-studied C. hadn’t studied D. didn’t study 13. Peter: “Did you need help with your Math last night?”. Mary: “If I had needed, I __________you”. a. would call B. called C. would have called D. will call 14. If someone __________ in to the store, smile and say, “May I help you?” a. comes B. came C. come D. should come 15. “Here’s my phone number”. “Thanks. I‘ll give you a call if I __________some help tomorrow” a. will need B. need C. would need D. needed 16. If I didn’t work for an accounting firm, I __________in a bank now. a. work B. will work C. have worked D. would work 17. The death rate would decrease if hygienic conditions __________improved. a. was B. is C. were D. had been 18-The education in Japan __________if the basic principles of education had not been taken into consideration. a. would go down B. would have gone down C. went down D. had gone down 19. If there __________, the rice fields could have been more productive. a. had been enough water B. were enough water c. would be enough water D. are enough water 20. The patient will not recover unless he __________ an operation. a. had undergone B. would undergo C. undergoes D. was undergoing 21. If she __________ him, she would be very happy. a. would meet B. will meet C. met D. should meet 22-If he __________ a thorough knowledge of English, he could have applied for this post. a. had had B. had C. has D. has had 23. If I had enough money, I__________ abroad to improve my English. a. will go B. would go C. went D. should have go to 24.The bench would collapse if they __________on it. a. stood B. stand C. standing D. stands 25-If it __________convenient, let’s go out for a drink tonight, a. be B. is C. was D. were

Mong chuyên gia giúp ;-;;;;; Dùng 0,2kg nhựa có khối lượng riêng D1 = 2kg/dm3 bọc xung quanh một quả cầu 1kg làm bằng kim loại có khối lượng riêng D2 = 8kg/dm3. Tính khối lượng riêng D của quả cầu mới được tạo thành ? NHANH!!! HELP!!!

Choose the best answer by circling its corresponding letter A, B, C or D . 1. Before going on holiday, you should _________ a ticket for the flight in advance so that you can buy a cheaper one. A. book B. rent C. lend D. borrow 2. Neighbors don’t spend _________ together as they used to do in the past. A. more time B. as much time C. little time D. less time 3. The weather is _________ we can not go swimming today. A. such hot day B. so hot that C. too hot to D. so hot a day 4. John: I am going on vacation in Da Lat tomorrow. - Marry: _________ . A. It’s my pleasure B. Have a good time C. Thanks a lot D. Better luck 5. Synn is _________ than her elder sister. A. three years younger B. younger three years C. three years old D. three years more

Exercise 4. Cho dạng đúng của động từ trong ngoặc 39. If Mel (ask) ____ her teacher, he’d have answered her questions. 40. I (call) the office if I (be) ____ you. 41. If they (listen) ____ carefully, they might hear the woodpecker. 42. If I had lain down on the sofa, I (fall) ____ asleep. 43. Ngoc could have worked as a model if she (be) ____ taller. 44. The soil (not/dry out) ____ if you water the plants regularly. 45. If you (give) ____ the young boy this stick, he’d hurt himself. 46. We (not/take) ____ the wrong tram if Dzung had asked the policewoman. 47. If the cat hides in the tree, the dog (not/find) ____ it. 48. The students would have solved the problem if they (use) ____ their textbooks. 49. If he washed his feet more often, his girlfriend (visit) ____ him more often. 50. Manh (read) ____ the newspaper if he went by train.

Tìm x |x+1| + |x+2| + ... + |x+20| =x+100

II. Choose the best answer for the following questions 1. _______ does your brother go fishing? He goes once a week. A. How old B. How often C. How D. What 2. Lan did not go to school yesterday_______ she was ill. A. so B. because C. but D. and 3. She _______ her homework 2 hours ago. A. is doing B. does C. did D. has done 4. _______ you been in HCM city? A. Do B. Has C. Did D. Have 5. If we reduce soil pollution,we .........................enough food to eat A. will have B. has C. have D. are having 6. They think they will stay ....the Moon ..........a short time. A. at/at B. at/for C. on/at D. on/for

Câu IV : (4,0 điểm): Cho AABC vuông tại A có B = 40°. a) So sánh các cạnh của AABC. b) Gọi D là trung điểm của AB. Qua D kẻ đường thắng vuông góc với AB cắt BC tại E. Chứng minh AADE = ABDE c) Tinh số đo EAC và chứng minh AAEC cản d) Gọi giao của AE và CD la G. Chúng minh CG=2GD. e) Trên tia đổi của tia AC lấy điểm M sao cho AM -AC. Chứng minh BA là tia phân giác của MBG

Exercise 4. Cho dạng đúng của động từ trong ngoặc 18. If Minh (get) ____ more pocket money, he (ask) ____ Lam out for dinner. 19. If we (win) ____ the lottery, we (fly) ____ to London. 20. If I (meet) ____ Brad Pitt, I (ask) ____ for his autograph. 21. If the weather (be) ____ nice, they (play) ____ football. 22. If we (go) ____ to a good restaurant, we (have) ____ a better dinner. 23. If An (learn) ____ more words, he (write) ____ a good report. 24. If the boys (take) ____ the bus to school, they (arrive) ____ on time. 25. If the teacher (explain) ____ the homework, I (do) ____ it. 26. If they (wait) ____ for another 10 minutes, they (see) ____ the pop star. 27. If the police (come) ____ earlier, they (arrest) ____ the burglar. 28. If you (buy) ____ fresh green vegetable, your salad (taste) ____ better. 29. If Alex (ask) ____ me, I (email) ____ the documents. 30. If he (speak) ____ more slowly, Peggy (understand) ____ him. 31. If we meet at 9:30, we (have) ____ plenty of time. 32. Lisa would find the milk if she (look) in the fridge. 33. The zookeeper would have punished her with a fine if she (feed) ____ the animals. 34. If you spoke louder, your classmates (understand) ____ you. 35. Dan (arrive) ____ safe if he drove slowly. 36. You (have) ____ no trouble at school if you had done your homework. 37. If you (swim) ____ in this lake, you’ll shiver from cold. 38. The door will unlock if you (press) ____ the green button.