Riddle #520

Question: Using 3 periods (.) and 1 question mark (?) make this a logical and grammatically correct sentence:

"That that is is that that is not is not is that it it is"

Question: What is that thing we buy for eating but cannot eat it?

Question: You build a house and all 4 walls are facing south. Where did you build the house?

Question: A girl dove in the sea.. some say there are two people under the sea. Why is that?

Question: What tastes better than it smells?

Question: What goes in the water black and comes out red?