Có 2 ô tô khởi hành cùng một lúc từ 2 tỉnh A và B cách nhau 350km nếu đi ngược chiều 2 xe gặp nhau sau 5 giờ còn đi cùng chiều từ A đến B và xe A đi trước 1 giờ rồi xe B mới xuất phát thì sau 3 giờ hai xe gặp nhau .Tính vận tốc mỗi xe

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Giúp mình với ạ III. Change these sentences into the passive voice. 11. Columbus discovered America. 12. The police caught the thief. 13. They didn’t look after the children properly. 14. They have changed the date of the meeting. 15. Tam broke the glass. 16. Nga left my handbag on the bus this morning. 17. People speak English everywhere. 18. Did her friends give her a lot of special presents on her birthday? 19. Last night we saw a lot of film. 20. They built the house in 2000. 21. The nurse told me to wait. 22. The nurse took me to another room. 23. The car hits the dog. 24. Does everybody in the class understand me? 25. My mother will prepare the food. 26. People speak English in most international conferences. 27. People make cheese from milk. 28. They cut the grass once a week. 29. People often eat raw fish in Japan. 30. People pick the fruit in the summer. 31. Someone always keeps the key in that box. 32. They store all the information in the computer. 33. They don’t include service in the bill. 34. They show many good movies on this channel. 35. People often drink strong coffee in my town. 36. They will repair the runway of this airport soon. 37. You should write your address on the parcel. 38. They will play traditional music at the reception. 39. Someone should test your eyes again. 40. They should build more houses for the poor. 41. They won’t invite their next door neighbors to their party. 42. Someone will tell you what to do then. 43. You should read this passage carefully. 44. They will pay you in cash. 45. You shouldn’t wash these clothes in hot water. 46. They built that bridge five years ago. 47. The students in my school hold a meeting every Saturday. 48. She bought a lot of flowers for her mother. 49. The children eat all the vegetables and meat. 50. Lan made her own handkerchiefs. 51. Their school will organize an art exhibition next month. 52. Lien didn't finish her homework. 53. Ba can fix his bike by himself. 54. You don't prepare your lessons before school. 55. They need to clean their classroom.