Good Riddles

Question: Which state can you leave or enter without changing your address?

Question: I am king of knowledge , also the king of madness Who am i ?

Question: What's a plate when it has three spoons in it?

Question: What can be stolen legally, it is not illegal to steal it?

Question: What are the next 3 words in the sequence: j,f,m,a,m,j,j,a,s_,_, and _?