Answer:
What has keys but no locks a space but no room and you can enter but can't go in?
Born of sorrow, grow with age, you need a lot of me to be a sage. What am I?
I go around in circles, but always straight ahead. Never complain, no matter where I am led. What am I?
I move without wings between silken strings. I leave as you find my substance behind
I am always around you but often forgotten. I am pure and clean most time but occasionally rotten.
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