Recently I have noticed that, in a casual conversation, I tend to end a lot of alternative type questions with ‘or’ followed by a short pause, during which I would wait the other people to response with an answer. Probably because I don’t know what to say for the other alternatives and expect the other person to fill the gap. To clarify with two examples:

>A: Are you conducting these surveys for your doctorate degree? Or ...       
B: Oh no, it’s just a pastime.


>A: Now that we are here, which one do you want to try first? The slide, roller coaster or...  
B: Let’s go on the Ferris wheel.

Do native speakers do this? Or do I need something after ‘or’, like ‘what/something’ for example?