Answer:
What is yours but only used by others?
A precious gift, yet it has no end, no beginning, and nothing in the middle.
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.
What travels around the world without leaving the corner?
Sally's mom has 5 children, Boby, Jimmy, Franky, Marly. Who is the last child?
I am a room that has a roof but no walls. What am I?