Answer:
What is black when it's clean and white when it's dirty?
You heard me before and then again. Afterward I die, until you call me again. What am I?
I am a word with 5 letters. Bold are the first; true are the second; playful are the third; clever are the fourth; forceful are the fifth.
My snake-like body cracks and burns. I cause pain but pleasure too. What am I?
I can run but not walk. Wherever I go thought follows close behind.
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.