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71. 1

72. At midnight

73. Because he lost his key

74. Twice

75. He spoke like a small child

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I.

76. To -> bỏ

77. Care -> carelessly

78. Will Ba -> Ba will

79. Happily -> happy

80. Students -> student

II.

81. What's wrong with this TV?

82. Hoa and Minh were absent from school yesterday because of illness

83. Nam can't swim as well as Binh

84. What is the width of the stadium?

85. We will have a Sa Pa tour that last for fives day, won't we?

86. Is that the best you can do?

87. Students don't have to wear uniforms on Wednesday

88. Watching TV makes she feel comfortable

89. It took us a whole day lto look for these old pictures

90. How far is it from your hometown to your school?

III.

91. There is a train leaving for Lao Cai at 5 o'clock every morning

92. It is about 300 km from HCm city to Phu Quoc island

93. Can we travel to Sa Pa by air?

94. If you are careful, you won't fall off your bicycle

95. Our teacher always drives carefully

96. Mr Tam used to go to work by car some years ago

97. Traffic rules should be obeyed strictly by road users

98. My mother used to wash clothes by hand in the past