根据下列短文内容，在短文后的空格处填上一个恰当的词，使短文完整、通顺。
Mr. Jones liked to be comfortable, so every time he took a train, he used to put a bag on the seat     to him and pretend that it belonged to a     who had gone to buy some cigarettes at the station.
One day, Mr. Jones did this again when the train was very crowded. When nearly all the seats were taken, an old man     on the train. Looking at the bag, he asked, "Is this seat taken?"
"Yes." said Mr. Jones, "it belongs to a friend of mine who has gone to buy some cigarettes. He will     back soon." Pretending to worry about his friend, he looked out of the window.
"All right," said the old man, "I'll just sit here until your friend    , if you don't mind." Mr. Jones couldn't say anything. Just then the train   to move out of the station.
"Well," said the old man, "what a pity! Your friend    the train, but his bag is still here."    Mr. Jones could say anything, the old man took the bag and threw it out of the window.