参考范文：
Mind Your Behavior in Public Places
Last Sunday, I went sightseeing with my friends in the Fairy Lake Park. The park was full of freshness and beauty of spring, with the sun shining and birds singing. When I was enjoying the fantastic scenery around, something unpleasant caught my eye. A young couple in a boat were eating, talking and laughing loudly as if they were the only people in the world. What’s worse, they spat and even threw rubbish into the lake, totally ignoring the noticeable sign,“No Littering”nearby. What a shame!
