Answer:
A large oasis in the desert. Come with cash and leave with none. What am I?
I am a room that has a roof but no walls. What am I?
What is the musical part of a turkey?
I'm the source of all emotion but I'm caged in a white prison.
I have Eighty-eight keys but cannot open a single door.
No matter how little or how much you use me, you change me every month.