Fun Riddles

Question: Many have heard me, but nobody has seen me, and I will not speak back until spoken to.What am I?

Question: I am taken from a mine, and shut up in a wooden case, from which I am never released, and yet I am used by almost everybody.

What am I?

Question: Poke your fingers in my eyes and I will open wide my jaws. Linen cloth, quills, or paper, my greedy lust devours them all.

What am I?

Question: How many eggs can you put in an empty basket?

Question: Why can't Kevin, who is now living in Canada, not be buried in the USA?