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 __1__（buy）something at the station．

One day，Mr. Jones did this when the train __2__（be）very crowded．When nearly all the seats __3__（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 __4__（come）back soon．” Pretending to worry about his friend，he __5__（look）out of the window．

“All right，” said the old man，“I'll just sit here until your friend __6__（return），if you don’t mind．” Mr. Jones couldn't say anything．Just then the train began __7__（move）out of the station．

“Well，” said the old man，“what a pity（遗憾）！Your friend __8__（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．