Yes, the required letter for the visitor visa application has been submitted to the embassy.
No, embassy personnel do not give out immigration (i.e. legal) advice.
Download the VISA application form of PRC and Supplementary VISA form of PRC from the internet, you can use this to apply at a Chinese Embassy and Consulate with members of the Embassy
To write a letter to the British embassy you first put your address. Next you put the date you are writing the letter then the address of the British embassy before finally writing the content of the letter.
Forgery
Send application to main US embassy in Mexico.
To write a letter of support for a visa application, address it to the appropriate embassy or consulate, introduce yourself and your relationship to the applicant, explain why you believe the applicant should be granted the visa, provide specific examples of their ties to their home country, and offer your contact information for further verification if needed.
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