Sure! Here are the completed questions for each sentence:

57. What is the price of a bottle of cooking oil?
=> How much does a bottle of cooking oil cost?

58. My father is driving his car to HN.
=> My father is traveling to HN by car.

59. My brother is driving to work now.
=> My brother goes to work by car.

60. Nam's father's car is white.
=> Nam's father's car has a white color.

61. There are three house floors in my new house.
=> My new house has three floors.

62. I cycle to school every day.
=> I go to school by bicycle.

63. What's your brother's job? - A doctor.
=> What does your brother do for a living?

64. Phong has a sister. Her name is Nhung.
=> Nhung is Phong's sister.

66. Does Phong's school have forty classrooms?
=> Are there forty classrooms in Phong's school?

67. Mr. Minh has a son, Trung.
=> Mr. Minh is the father of Trung.

68. Huyen walks to school every afternoon.
=> Huyen goes to school by walking every afternoon.

69. My father usually drives to work.
=> My father usually goes to work by car.

70. Does your class have twenty-five students?
=> Are there twenty-five students in your class?

Feel free to ask if you need further assistance!