（二）单词拼写：请根据所给首字母或中文提示，写出单词在句中的正确形式，每空只能填一词。

71. I’m              （抱歉）. I can’t spell “blackboard”.

72. How many             （男孩）are there in your class?

73. Please               （写）your name on the blackboard.

74. A lot of               （学生)）are on the playground.

75. Smoking is not good for               （你）.

76. Let’s p             football after school.

77. ---How are you?

   ---I’m f           . Thanks.

78. ---What’s the w             like in spring?

   ---It’s warm.

79. Her brother is thirteen y            old.

80. The library is b            the classroom building and the dining hall.