根据句意和所给首字母或汉语提示完成单词。

1．There are 90 teachers in our school．About half of them are w        

2．I am b        my little sister for vacation．

3．My sister is d          from me．I'm calm．She is outgoing．

4．I can’t finish the work on time          (无，没有)your help．

5．I don’t think differences are important in a        (友谊)．