用括号内所给动词的适当形式填空，必要时可加助动词或情态动词。
Mr. Jones liked to be comfortable, so every time he took a train, he used to put a bag on the seat next to him and pretend that it belonged to a friend who had gone     (buy) something at the station.
One day, Mr Jones did this when the train (be) very crowded. When nearly all the seats (take), an old man got on (上) the train. Looking at the bag, he asked, “Is this seat taken?”
“Yes,” said Mr Jones, “It belongs to my friend who has gone to buy some cigarettes. He  (come) back soon.” Pretending to worry about his friend, he    (look) out of the window.
“All right,” said the old man, “I’ll just sit here until your friend  (return), if you don’t mind.” Mr Jones couldn’t say anything. Just then the train began (move) out of the station.
“Well,” said the old man, “what a pity (遗憾)! Your friend (miss) the train already, but his bag is still here.” Before Mr Jones could say anything, the old man took the bag and threw it out of the window.