Answer:
What is the only question you can't answer yes to?
You draw a line. Without touching it, how do you make the line longer?
When is homework not homework?
No matter how terrible things get for the people of the Arctic, they will not eat a penguin. Why not?
What always comes into a house through the keyhole?
I only exist when you are here. Where you never were I can never be.
Logic
Animal
Difficult
Easy
Food
Funny
Kids
What am I?