Mr Evans lived in a city. He was a maths teacher three years ago. He taught well and his students liked him. So he decided to work in the middle school_______. But a terrible accident changed his life.
One spring he took his class to visit a place of interest.（名胜）The children saw a lot of _______ things and had a good time there. ______on their way to school, their bus was hit by a truck. Five students died in the accident. He didn't know ___ it had happened and was very sad about it and after he came out of hospital, he left the school and became a _____. He tried his best to stop the drivers from _______ the traffic rules. He worked hard and was strict(严格) with the drivers.  ______they were afraid of him.
One afternoon it was very hot. Mr Evans was working. He was _____at the crossing and watching the traffic._ _ he saw a cleaner（清洁机）. It ran so______ that it almost hit(撞上) a man riding a bike. He stopped it at once and the man stays safe.