Answer:
A hill full, a hole full; yet you cannot catch a bowl full. What is it?
What instrument can make any sound and be heart, but not touched or seen?
Don't do this in the shallow end.
The more of them you take, the more you leave behind. What are they?
Break it and it is better, immediately set and harder to break again
I have two eyes in the front and a lot of eyes on my tail