Answer:
I make billions of dollars selling windows. Who am I?
The more of this there is the less you see. What is it?
I am a certain five-letter word and become shorter when you add two letters to me. What am I?
What has a head and a tail, but no body or legs?
I am always around you but often forgotten. I am pure and clean most time but occasionally rotten.
What made Cyclops quit teaching?
What am I?
Animal
Difficult
Easy
Food
Funny
Kids
Logic