为迎接"世界无烟日"的到来，上周你校开展了主题为"创建无烟校园"的系列活动，内容包括：设计禁烟海报、举办演讲比赛以及师生签订戒烟承诺书等。请你用英语写一篇报道介绍此次活动，并发表在你校英文报上。
注意：
1.词数100左右；
2.可适当增加细节，以使行文连贯。
参考词汇：smoke-free campus 无烟校园 letter of commitment 承诺书

【考点】主题式．

【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.