Answer:
Sometimes I am white, sometimes I am dark. Most people love me. What am I?
I help engines spin and pants stay up
I am easy to waste. I am unstoppable. What am I?
I can only be played on a windy day
I am just two and two. I am hot. I am cold. I am the parent of numbers that cannot be told. I am a gift beyond measure, a matter of course. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.