Answer:
Who makes it, has no need of it. Who buys it, has no use for it. Who uses it, can't see it. What is it?
What gets whiter the dirtier it gets?
If you drop me I'm sure to crack but give me a smile and I'll always smile back. What am I?
I flow from the Homerβs mouth when he sees doughnuts.
Part carbon, part water, I am poison to the fishes. Many falsely claim my name, I am the pause that refreshes. What am I?
Give it food and it will live, give it water and it will die.