604、I was going over to the library to study. 605、I won’t get any studying done there at all. 606、I’m trying to finish the reading assignment for our physics class. 607、I’ve got to start preparing tonight. 608、The problem is that I missed two days of class last week. 609、I’ve got to go to baseball practice. 610、Are you going to the class meeting later? 611、How many classes have you missed so far? 612、He’s involved in too many sports and activities. 613、I’m going to the gym for a little bit. 614、What are you writing about for your class paper? 615、I’ve got to go meet a professor. 616、Do you want to study together? 617、I’m going to get some coffee in the dining hall. 618、The dean wants to meet my parents.