仔细观察下面四幅图，写一篇90字左右的短文。要求故事完整，情节合理。表达准确，文字简练。
One afternoon after school, Jack and his classmates were waiting for a bus at a bus stop. Suddenly they saw a bag of rice drop clown from a truck. They shouted to the driver, but the truck drove away without any response. At this moment, a young man came over tiding a bike. He was riding so fast that he hit the bag heavily. He was seriously hurt.
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