My school has about four study rooms and a lecture hall. There are many seats, but one or two weeks before the exam, there are often visitors there, and the seats are very tight. Regular customers usually occupy a fixed seat, and the table is full of many things, such as cups, walkman, paper extraction and so on. When people leave, they just put the books on the table, as if the owner would come back soon. In this case, few people usually occupy his seat. The other students just stayed there for one day.