ABSTRACT
Recently, however, Zach noticed that Tony often did not return to the apartment until much later, and usually he had already eaten something when he got home. Sometimes he went straight to his room and got on the computer, and often he was already gone the following morning before Zach had gotten up for the day. Last weekend, Tony had declined to play golf with Zach and his friends, opting for a day at the school library. The weekend before, Tony had gone on a camping trip with friends from his work without inviting Zach.
