根据句意和首字母提示，完成下列单词。
1. I would like to become a b________because I like birds and nature very much.
2. I think it is important that I do something to p________birds.
3. He works in a bank, but his h________is building model boats.
4. You can use any two colours, for e________, red and yellow.
5. Is there any r________why you can't come?
