Thank you, Yumeng again for your help. It is very nice of you, and I wish my experience could help others too, and wish everyone luck.
Yumeng, I remember you asked a question concerning inviting parents to the States, and someone posted a list of documents that need to be prepared as the answer. Do you still happen to have it? I want to invite my parents, but I couldn't find the post now for some reason. Thanks.