Best Riddles and Answers

Question: I can be one, I can be two. I can be Open, Closed, Empty or Full. I can be Bare, but never a Bear. What AM I??

Question: in all of written history I won't show up at the end of a sentence but I will be there in the end . . .

Question: Act in my name, and thus remove me. What am I?

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 _?