Seating is a common problem in universities. But I don't like this kind of behavior very much, although I usually help my roommate to occupy a seat. But I still don't think this behavior is very good. In this way, those students who come early can't find seats. And sometimes occupying a seat in the library takes up a little resources, so that students who want to study can't find a good place to study. So try not to occupy a seat. I don't support this kind of behavior.