Good Riddles

Question: If Washington went to Washington,and Washington washed the clothes how many w's are there in all?

Question: It makes everyone blind. You can't see it and it will always come back for you.

Question: In Tennis I'm zero, To Many I'm A Hero. What Am I?

Question: Hollow of water, tongue of wood, skin of stone, long I've stood. What am I?

Question: Where do burgers like to dance?