把A - E 五个选项填入文中空缺处，使短文内容完整、正确。
My friend has a large police dog , Jim.   Every Sunday afternoon my friend takes Jim for a long walk in the park.   
One Saturday afternoon a young man came to visit my friend.   He talked and talked. Soon it was time for my friend to take Jim for his walk.    Jim became very worried about his walk in the park. He walked around the room several times and then sat down in front of the visitor and looked at him.   He went on talking. Finally Jim could not stand any longer. He went out of the room and came back a few minutes later. He sat down again in front of the visitor but this time he held the visitor's hat in his mouth.