為迎接"世界無煙日"的到來，上周你校開展了主題為"創建無煙校園"的系列活動，內容包括：設計禁煙海報、舉辦演講比賽以及師生簽訂戒煙承諾書等。請你用英語寫一篇報道介紹此次活動，并發表在你校英文報上。
注意：
1.詞數100左右；
2.可適當增加細節，以使行文連貫。
參考詞匯：smoke-free campus 無煙校園 letter of commitment 承諾書

【考點】主題式．

【答案】To welcome the arrival of world Day，our school held a series of activities to create a smoke-free campus last week.
First，each class designed a poster，presenting the harm of smoking，both to the smokers themselves and the people around them.Second，we held a speech contest，during which the teachers and the students introduced their understanding of the importance of giving up smoking.Third，all the teachers and students signed a letter of commitment in which they promised never to smoke in the campus again.
These activities ensured us a clean and healthy campus environment.We believe that we will enjoy a healthier world with more and more people keeping away from smoking.