在下列各句的空格内填上一个适当的完整的单词，该词的首字母已给出。

小题1:September is the n        month of the year.

小题2:Tell you the t        , I’m not interested in his article.

小题3:You can come to see me at any time b         three and five tomorrow.

小题4:Tomorrow is my f         birthday. Let’s get him a nice present.

小题5:It was so dark that I could h          see anything.

π是一个[ ]

A..整数

B.无限循环小数

C.无限不循环小数