语法填空
阅读下面材料，在空白处填入适当的内容或括号内单词的正确形式。
One morning, I was waiting at the bus stop, worried about       (be) late for school．There were many people waiting at the bus stop,         some of them looked very anxious and       (disappoint) . When the bus finally came, we all hurried on board．I got a place next       the window, so I had a good view of the sidewalk．A boy on a bike      (catch ) my attention．He was riding beside the bus and waving his arms．I heard a passenger behind me shouting to the driver, but he refused  ______ (stop) until we reached the next stop．Still, the boy kept ______ (ride). He was carrying something over his shoulder and shouting．Finally, when we came to the next stop, the boy ran up the door of the bus．I heard an excited conversation．Then the driver stood up and asked,“       anyone lose a suitcase at the last stop?” A woman on the bus shouted, “Oh, dear! It ‘s       (I)”．She pushed her way to the driver and took the suitcase thankfully. Five others on the bus began talking about what the boy had done and the crowd of strangers      (sudden) became friendly to one another．