Answer:
I am made of wood but can't be sawed? What am I?
I row quickly with four oars but never comes out from under my own roof.
What gets sharper the more you use it?
I don't live within a house, nor do I live without. Most will use me when they come in, and again when they go out. What am I?
I am used to bat with, yet I never get a hit. I am near a ball, yet never thrown. What am I?
What language does a billboard speak?