Answer:
What is the word that even in plain sight remains hidden?
What is black when it's clean and white when it's dirty?
What has a head and a tail, but no body or legs?
The warmer I am, the fresher I am. What am I?
I have an eye, but I can't see. I usually have to work with something in my eye. What am I?
What did the piece of wood say when he saw the screwdriver and screws approaching?