Could you fax the document to us, please?
您能将文件传真给我们吗？
We need to receive the document as soon as possible. Could you fax it to us?
我们需要尽快得到此份文件。您能将它传真给我们吗？
Could you fax me information about your web service?
您能把您的网络服务方面的信息传真给我吗？

Your cooperation will be greatly appreciated.
非常感谢您的合作。
Your support will be deeply appreciated.
非常感谢您的支持。
Your interest will be greatly appreciated.
非常感谢您的青睐。