Answer:
My second is performed by my first, and it is thought a thief by the marks of my whole might be caught.
What has a ring but no fingers?
What does a stone become when in the water?
What has keys but no locks, Space but no room, You can enter but you can’t exit.
It is in every mountain, it's not in any hill, it's not in all the world, and yet it's in the mill.
I am a room that has a roof but no walls. What am I?
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?