Answer:
I run around the city, but I never move.
This thing all things devours: Birds, beasts, trees, flowers; Gnaws iron, bites steel; Grinds hard stones to meal; Slays king, ruins town, And beats high mountains down.
What gets closer when you blink?
I am a precious little thing, dancing and eating all the time. Watch me from a distance, so you can feel my warm and gentle love. But don't come to close or my next meal you could be!
The more of it there is, the less you see.
What did the piece of wood say when he saw the screwdriver and screws approaching?