Answer:
I belong to you but others use me more often than you do. What am I?
What is black when you buy it red when you use it and gray when you throw it away?
Lovely and round I shine with pale light grown in the darkness a lady's delight.
I have a brother. However much we run we do not reach each other.
What is harder to catch the faster you run?
What never gets any wetter no matter how hard it rains?