Answer:
I am black when you buy me, red when you use me. When I turn white, you know it's time to throw me away. What am I?
When you stop and look you can always see me. If you try to touch you cannot feel me. I cannot move but as you near me I will move away from you.
I run smoother than any rhyme, I love to fall but cannot climb. What am I?
I am rarely touched but often held. If you are smart you'll use me well. What am I?
I don't live within a house nor do I live without. Most will use me when they come in and again when they go out.
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?