Answer:
I can be swallowed, but I can also swallow you. What am I?
You may enter, but you may not come in. I have space, but no room, I have keys, but open no lock. What am I?
Use me to reward good behavior.
I make a living following the wealthy and beautiful.
Sometimes dark and sometimes bright, I make my way among twinkling lights. Seas and oceans obey my call, yet mountains I cannot move at all. What am I?
What made Cyclops quit teaching?