根据短文内容判断下列各句正误。 Two old men,Bob and Alf,were waiting in line outside the stadium(体育场).They were waiting to get into watch a football game. They were both poor and could not buy tickets for seats in the best part of the stadium.They were standing in line to get into the cheapest section(部分). They both liked football.Every week they watched the game.Today when they got to the gate of the stadium,a man was checking the tickets.Bob showed his ticket and went in.Alf started looking for his ticket,first in his trousers pockets,then in his jacket pockets and his shirt pockets.The man became angry. "What's that in your mouth?he asked. "Oh,it's my ticket.I knew I had it somewhere." He took the ticket out of his mouth and showed it to the man at the gate. "OK....OK....the man at the gate said."You can go in”. When Alf went inside the stadium, Bob said,"That's not the place to keep your ticket.” "Yes,but when I took the old ticket out of my mouth,the date came off(脱落)too"