1. 选出同类项。

A. passport B. shoes C. nervous D. airport E. when

1. （1） It's not safe to climb the trees.
   
3. （2） Let's go to the library.
   
5. （3） Please show me your ticket.  
   
7. （4） What are you going to take?
   
9. （5） Mum bought me a new T­shirt yesterday.