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假设你是李华，于2010年6月3日搭乘国外某航空公司航班(flight number BA793)回国后，发现遗失了一个行李箱(suitcase)。现请用英文给该航空公司写一封信，请他们帮你寻找。信件要点包括：

○陈述写信原因

○简要描述该行李箱

○说明其重要性

○期待回复并表示感谢

注意：词数不少于120。

【范文欣赏】 　请进行完形填空(每空一词)

Dear Sir，

My name is Li Hua, and I took your flight (flight number BA793) 1.on June 3, 2010.I was quite satisfied with your service, 2.but when I arrived at the destination, I found my suitcase lost. 3.So I am writing the letter hoping to get your help to find my suitcase.

My suitcase is a big black one with 4.a long handle.It is very important to me, 5.because both my ID card and passport are in it.In addition, it also contains some confidential documents of my company. 6.Once they are lost, it will cause great damage to my company.

I will appreciate 7.it very much if you can help me out with this situation.I am looking forward 8.to your reply.

Truly yours,

Li Hua

(129 words)

【名师点评】 书信格式正确，行文规范，包含所有要点，符合请求信的特有要求。表达明确，言辞恳切，礼貌得体，流畅自然，是一篇恳求信的佳作。I will appreciate it very much if you can help me out with this situation的表达地道，高级词汇destination/confidential documents等的运用足见作者扎实的基本功。