题目内容：

以下每句均有错误，错误涉及一个单词的增加(∧)或一个单词的删除(\，其他错误为单词的修改。每处错误及其修改均仅限一词。

1.If you don't work hard，you fail the test.

2.You should get up early，or you'll be late of school again.

3.We must be strict in ourselves in the study.

4.I have to pass a math test this afternoon.I feel kinds of nervous.

5.I sometimes get to the class late.