（2023九上·宁波开学考） 阅读下面短文，在空白处填入一个适当的词，或填入括号中所给单词的正确形式。
One morning. I was waiting at the bus stop, worried about being late for school. There were many 　71． 　 (passenger) waiting at the bus stop, but some of them looked very anxious and 　72． 　 (disappoint). When the bus finally came, we all hurried on board. I got a place next 　73． 　 the window, so l had a good view of the sidewalk (人行道). A boy on a bike 　74． 　 (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 didn't stop 　75． 　 we reached the next stop. Still, the boy kept 　76． 　 (ride). He was carrying something over his shoulder and shouting.
Finally, when we came to the next stop, the boy ran up to the door of the bus. I heard an exciting conversation. Then the driver stood up and asked, "Did anyone lose 　77． 　 suitcase at the last stop? " A woman on the bus shouted, "Oh dear! The suitcase is 　78． 　 (I). " She pushed her way to the driver and took the suitcase thankfully. Everyone on the bus began talking about 　79． 　 the boy had done, and the crowd of strangers 　80． 　 (sudden) became friendly to one another.