Answer:
What is always coming but never arrives?
People buy me to eat but never eat me. What am I?
Draw fire or fill me; I'm still empty.
I move without wings, between silken strings. I leave as you find my substance behind. What am I?
What comes once in a year twice in a week but never in a day?
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.