短文填空 根据短文内容及首字母提示，补全空格内单词，使短文完整、通顺。
There were three old teachers at the railway station. They were talking happily. The train a  ,  but they did not notice (察觉). Then the conductor(列车长)  shouted, “G   on the train and take your seats, please!”
The teachers heard the conductor and rushed for the train. T     of them got on the train b      it moved. The third one didn’t get on the t     . It was Mr Green. He looked w    .
One of his students was at the station. He t    to comfort (安慰) the teacher. “It wasn’t really b  , sir,” said the student. “Two out of three caught the train. That’s quite good, you know.”
“I know.” the teacher said. “But it was m  train. My friends only came to s     good-bye to me.”