Answer:
What must be looked through in order to see?
A person's greatest asset.
Where can you add 2 to 11 and get 1?
Inside a burning house, this thing is best to make. And best to make it quickly, before the fire's too much to take.
Is always in front of you but cannot be seen?
I am the fountain from which no one can drink. For many I am considered a necessary link. Like gold to all I am sought for, but my continued death brings wealth for all to want more.