Answer:
you cannot keep me until you have given me
I dig out tiny caves and store gold and silver in them. I also build bridges of silver and make crowns of gold. Sooner or later everybody needs my help yet many people are afraid to let me help them.
So simple, that I can only point. Yet I guide men all over the world.
I can fall off a building and live but in water I will die.
A little pool with two layers of wall around it. One white and soft and the other dark and hard, amidst a light brown grassy lawn with an outline of a green grass. What am I?
I flow from the Homerβs mouth when he sees doughnuts.