2、意外事故、意外事故、天灾人祸

　　开头（说明事故）

　　I was walking along the street when a terrible accident happened in the street.

　　One day something unpleasant happened.

　　The girl fell off her bike and was badly hurt.

　　An elderly man was hit by a car while he was crossing the road.

　　He fell down to the ground with a cry.

　　A big fire broke out in an office building in a busy street.

　　中间（说明过程）

　　Fortunately, the injured people were sent to hospital without delay.

　　The girl was too frightened to move.

　　It was soon found out that the driver had drunk too much wine before driving.

　　The fire lasted about two hours and was finally put out in the afternoon.

　　结尾（说明结果）

　　The accident delayed all the traffic for an hour and caused the damage of $80,000 Lots of people lost their lives in the floods.

　　The big floods, which occurred in 1998, caused great losses.

　　The cause of the fire has been unknown.

　　It is being investigated.

　　As a result, the three-storied building was destroyed, 50 people were killed, and more than 200 were injured.

　　Up to the present, the cause of the accident is still unknown.