根据下列句子的意思及汉语提示,写出空缺处单词、固定短语或固定搭配的正确形式。
81. ________________(二月) is the second month in a year.
82. How many __________________(科目) do you have at school?
83. Tomorrow is my father’s __________________(四十九岁) birthday.
84. He likes ___________________(做运动) after class in the afternoon.
85. Shanghai is one of_____________________(大城市) in the world.