Answer:
I am a room that has a roof but no walls. What am I?
I am a box which holds keys but not locks. With the right combination, I may unlock your soul. What am I?
No legs have I to dance, no lungs have I to breathe. No life have I to live or die, and yet I do all three. What am I?
Born in the ocean and white as snow. When I fall back to water I disappear without a trace.
I have green hair a round red head and a long thin white beard.
No matter how little or how much you use me, you change me every month.