I choosed yes for both. For ghosts, I believe that they are just people and other animals that do not have bodies, and probably manifest themselves as electrical or magnetic interferences. As for aliens, I personally feel that, because the universe is so large, and because we can already prove the existence of other solar systems out there with planets, we can't completely dismiss the fact that one or more of them might be inhabitated. I don't think that living organisms need an environment like Earth to survive; organisms like bacteria have proven themselves to be capable of life even in outer space.
I'm keeping an open mind on both matters, though. You know, the nature of such topics.