Answer:
What is black when you buy it red when you use it and gray when you throw it away?
In a tunnel of darkness lies a beast or iron. It can only attack when pulled back. What is it?
I am commonly ate before I'm born and after I'm dead.
You can never eat me for breakfast or lunch. What am I?
I have hundreds of ears but cannot hear a thing. What am I?
What language does a billboard speak?