Answer:
A precious gift, yet it has no end, no beginning, and nothing in the middle.
I'm the son of water but when I return to water I die. Who am I?
What is at the end of every rainbow?
What instrument can make any sound and be heard but not touched or seen?
Watches students at the prom to make sure there's no funny business.
Two little holes in the side of a hill. Just as you come to the cherry-red mill.