Last Friday afternoon,four students were on their way home.Suddenly,they saw a truck coming from the corner at a high speed,and some watermelons fell off.At the same time,a middle-aged man on a bicycle fell to the ground,blood coming from his body.They were shocked by this situation but they didn't hesitate to help the people who were injured in this accident.One of them called the policemen and one dialed 120 while the others were taking care of the cyclist.Soon the policemen came and they reported what they had seen.The policeman praised their bold behavior.These four students didn't leave until the ambulance took the cyclist to the hospital.This may be an unforgettable experience for them.