Am I eligible for EB1-C category? I am working here in US on H1B

If you meet all other requirements then theoretically, yes, you are eligible. A lot depends what was submitted in your H1B application. Your past...

What do I need to do to reenter the US after my L1-A visa is terminated?

ESTA or visitors visa. Please do not try re-entering on L1 Visa. It is valid till the duration of employment.

Re-entering the U.S. with B2 Visa to finish my hobby program

Please contact an immigration attorney.

Can she live with her spouse in Viet Nam but still keep her U.S. Citizenship?

Her citizenship is safe. Citizenship unlike permanent residence does not require an intent to reside in the United States.

Does retired sponsor have to submit any other document beside I-864 and tax return?

The sponsor will have to produce all the documents to prove that they have adequate means of financial support. There is no exhaustive list for...

Can someone with both a valid B1 and F1 visa enter into the US on a B1, and then later change status to F1 while in the US ?

An F1 visa is granted after you have been admitted in a course in a school or a collage in the the United States. Therefore, if you entering the...

There is a difference in getting away with clerkships and being allowed to do clerkships. Clerkships and internships are not allowed without a...

I call the uscis on the 2/3/2015 to expedite my initial work permit base on asylum pending after 76 days pending with no update

Unfortunately, it is hard to say. Case being assigned to an officer may or may not lead to a faster processing.

Can USCIS or employer can revoke my GC anytime? And will there be any issue for me at Port of Entry?

You need to consult a U.S. Immigration Attorney with all the paperwork.

Does my Chinese fiancé need to go back to China to do the embassy interview and finish the k1 visa ?

It is residence based not nationality based. Wherever he is a resident that consulate will entertain his petition.