Answer:
What is a five-letter word that has brain in it?
What is often returned, but never borrowed/
I appear in the morning. But am always there. You can never see me. Though I am everywhere. By night I am gone, though I sometimes never was. Nothing can defeat me. But I am easily gone.
Give it food and it will live, give it water and it will die.
My teeth are sharp, my back is straight, to cut things up it is my fate.
What language does a billboard speak?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?