After arriving on a fiancee visa, is it possible for us (I'm the sponsor/fiance) to process GC while living in China?

You can do so and with proper planning may be able to complete part of the filing process.

I-765 EAD question

H1B work does not need a separate work authorization.

Do I lose old citizenship when I naturalize?

Allegiance is doing more with your citizenship than just holding a passport. U.S. laws do not take away your prior citizenship.

There may be a few options on how best to derive permanent residence in her situation. It would be good to obtain private consultation to choose a...

I'm married to American citizen for two and a half years now. We are living abroad. Can I get a green card ?

To avoid possible issues, you may be able to apply once you have planned out your move in to U.S.

How long will it take to receive conditional permanent residency after marrying a US citizen if already on temporary work visa?

For specific legal advice for your situation it is ideal to seek in private consultation.

H1B question

You need specific advice on "how to" for the visa interview. USCIS is rolling out approvals now. You can wait until both petitions are approved.

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What is happening when I overstayed my visa,and I don't have current status?

You are in unlawful presence currently which can be cured.

Is it a violation of my F-1 status if I do an internship without applying for an OPT and receive a stipend for that internship?

F-1s are required to have OPT approval before starting work.

OPT question for current F1 students.

One OPT is allowed for each level of course of study.