根据汉语意思完成句子。

1. What's your _____ (最喜欢的) CD? It's Dance, Dance, Dance.    

2. I think he can become a _____ (职业的) basketball player.    

3. The old woman has raised lots of money for _____ (无家可归的) children.    

4. _____ (循环利用) paper is a good way to keep our school clean.

5. My friends are willing _____ (帮助) old people.