超级高手帮翻译下 准确点 3Q

Dear SIR,

Thank you for taking the time to read this letter. My name is Nan LIU and I has been submited my application for residence permit for students in sep.18,2007.Due to the dead line of my airplane ticket is July 20th. So I was wonder if you can check my documents and let me know it is completely or not.
Thank you very much. Your assistance will be greatly appreciated.
我想把Due to the dead line of my airplane ticket is July 20th. 这句该成因为学校月底开学！

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