题目内容：

在下列各句的空白处填入一个适当的词，使句子意思完整、语法正确。

1.I’m not sure about where he is now. ___________ he is in the library.

2.Tom forgot to take an ___________ so he got wet when it was raining.

3.I walk to school every day because my home is ___________ to our school.

4.Friends often ___________ happiness and sadness with each other.

5.They are twins but they have little in ___________.