Answer:
What is in the middle of nowhere?
What object has keys that open no locks, space but no room, and you can enter but not go in?
What goes through a door but never goes in and never comes out?
What is used by man, tossed by trees, everywhere but unseen?
What has fingers and a thumb but no hand?
What did the piece of wood say when he saw the screwdriver and screws approaching?