Answer:
The more you take of me the more you leave behind.
Break me and I am better immediately set and harder to be broken again.
I may be of the eye, in order I am pie. In my center there is a star, I keep medics where they are. What am I?
I run around the city but I never move.
I'm not really more than holes tied to more holes; I'm strong as good steel, though not as stiff as a pole.
What language does a billboard speak?