I generally stare at the wall or out the window. I make an effort to look at them, but I don't make too much of an effort because I figure they are equipped to deal with my awkwardness better than most in the world. Two times I do specifically look at them (and I think they've picked up on this) is when I am finished speaking to indicate that I'm done or when I'm saying something bluntly, something that I'm definitely sure about.