书面表达。
假设你是卜曼宜，你购买了一部某外国公司生产的手机，因有质量问题，要求该公司更换。
请根据下列要点，用英文写一封电子邮件。
要点：
1. 问题：手机不响铃，不能发短信；
该产品已售完，无法更换；
型号新，无配件，无法维修。
2. 要求：公司应尽快予以更换。
注意：
1. 词数为100左右；
2. 参考词汇：配件-spare part
3. 电子邮件的开头和结尾已为你写好（不计入总词数）。
Dear Sir,
_____________________________________________________________________________
________________________________________________________________________________
Sincerely yours,
Bu Manyi
Dear Sir,
I am writing to you for the mobile phone of Dephone-S250 I bought on 20th April 2008 at Tele Mail
in Wuhan, P. R. China. Ten days after that, it didn't ring and send out messages. Then I took it to the seller,
but was told that the products of this model had been sold out and I had to wait at least three months for a
new one. Later I went to the repairman. He said since it was a new model in China, it was impossible to fix
it without the right spare parts. I was so desperate on hearing that. How can I wait that long? Therefore, I
require that you send me a new one of the same model within a month.
Thank you for your consideration.
Sincerely yours,
Bu Manyi
答案不唯一