Answer:
What has keys but no locks a space but no room and you can enter but can't go in?
You see a boat filled with people. It has not sunk but when you look again you don't see a single person on the boat. Why?
You seek me out when your hunger's ripe. I sit on four legs and smoke a pipe.
cloud is my mother wind is my father.
It's in your hand though you can not feel it. Only you and time can reveal it.
No matter how little or how much you use me, you change me every month.
What am I?
Animal
Difficult
Easy
Food
Funny
Kids
Logic