题目内容：

根据所给汉语提示，写出句子空白处各单词的正确形式。每空限填一词。

1.Snakes are        (危险的) animals and I don’t like them.

2.Thank you for         (发送) me so many books.

3.There are about ________ (四十) students in our class.

4.He________ (花费) lots of money on computer games.

5. Look! The boys are ________ (踢) football happily.