Riddle #194

Question: A natural state, I'm sought by all.
Go without me, and you shall fall.
You do me when you spend,
and use me when you eat to no end.

What am I?

Question: What kinds of balls do dragons play soccer with?

Question: What has a bed that you can't sleep in?

Question: What can be broken but never forgotten?

Question: People see through me, but none pass through without killing me. I can be anywhere, and can be seen double or single. What am I?

Question: What cannot be seen or felt, but can only be broken by voice?