1. 根据所给句子，填入一个适当的单词，使句意完整。
（1）December is the ________ month in a year.
（2）David plays sports every day so he is very ________.
（3）We have sixty teachers in our school, twenty men and forty ________.
（4）Eric is my uncle's ________. He is my cousin.
（5）I'm sorry, Mrs. Miller. I'm ________ for school.
