Answer:
Temporary evidence of where you've been strolling
What instrument can you hear but never see?
When a doctor hits you with a hammer he is testing this
What is it that no man ever saw, which never was, but always will be?
Many foods can make me strong but give me water and I won't last long.
What did the piece of wood say when he saw the screwdriver and screws approaching?
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?