It was raining hard. Liu Mei was riding back home. Suddenly she fell off her bike and hurt her leg badly. She lay on the ground and couldn’t move. A police officer stopped a taxi and sent her to the nearest hospital at once. While the doctor was looking her over carefully, the police officer left the hospital quietly. The doctor said that she needed to have a rest in bed for a few days and she would become better very soon. After a while, Liu Mei wanted to thank the kind police officer, but she found that he had left. How warm-hearted the police officer was!