Answer:
I help you carry your books.
The person who makes it sells it. The person who buys it never uses it. The person who uses it never sees it. What is it?
I am taken from a mine and shut in a wooden case from which I am never released. Yet I am used by almost everybody. What am I?
I run up and down the stairs without moving. What am I?
I have keys but no locks. I have space but no room. You can enter but can't go outside. What am I?
I flow from the Homer’s mouth when he sees doughnuts.
What am I?
Animal
Difficult
Easy
Food
Funny
Kids
Logic