In my opinion, people who study in fast food restaurants like KFC and McDonald's have a feeling of showing off. Why must they study in crowded places? And when we all know that KFC and McDonald's are crowded, we may not even find a seat. Then the people who study first occupy this seat, but they don't eat, they just study. I think such people are particularly fond of showing off. It feels like telling others that you are all eating and playing, and I am studying next to you.