C# mini-quiz: conversions

At the behest of the Many-Tentacled One, I've made a short C# quiz. I'm not as cruel as Washu, however, so we'll be breaking up the quiz into several individual mini-quiz entries rather than barraging you at once with an interrogative onslaught.

C# introduces a few new operators that aren't always in other languages. Are you sure about what's going on? Take this short quiz about conversions and the "as" operator and find out.