One day, Mary and John were on the way home from school. Mary was using her phone and John was enjoying music with his headphone. Both of them weren’t paying attention to their surroundings. All of a sudden, Mary bumped into a tree. Her phone dropped to the ground and broke. A mother and her daughter walking behind them were shocked by the accident. However, it seemed that John didn’t know what happened to his friend. He kept walking forward, singing along with the music. He was so indulged in his music and didn’t notice a car was approaching him. The driver honked the horn angrily for several times. Yet, John had no response to the driver. Finally, the driver got off the car and scolded John for his careless, reminding him of how dangerous it was to be careless while walking on the road. After this incident, Mary and John learned a lesson that is not to use their phones nor to l...