Answer:
I run around the city but I never move.
I am always around you but often forgotten. I am pure and clean most time but occasionally rotten.
I am heavy forward but backward I am not. What am I?
I am the place to turn to when nature calls. What am I?
I always run but never walk often murmur but never talk have a bed but never sleep has a mouth but never eat.
What language does a billboard speak?