Answer:
The more you take away from me the bigger I shall get.
The more you add the less it weighs. What is it?
Two in a whole and four in a pair. Six in a trio you see. Eight's a quartet but what you must get is the name that fits just one of me.
I have keys but no locks. I have space but no room. You can enter but can't go outside. What am I?
When I am caught, I am thrown away. When I escape, you itch all day. What am I?
What made Cyclops quit teaching?