No your fees will not be refunded if you later withdraw your application.

Can an US citizen sponsor a significant other/spouse while the US citizen stays in another country?

Yes you can do so but you must provide evidence of your intent to domicile in the US.

Can I walk into the immigration office without an appointment to get an I-551 stamp?

You can schedule an Infopass appointment to do so, but I agree with my colleague - you may need a receipt of I90 replacement green card.

Greencard holder and shoplifting

It can affect you for citizenship unless it falls under an exception to affecting your good moral character. It is best to consult with an attorney...

I'm a lawfully admitted nonimmigrant. Can I sponsor my foreign girlfriend for her F1 visa, even though we're not married/family?

You can petition for her but you will need to wait until the visa becomes available as you are a LPR. In the meantime she would need to remain in...

Studied abroad & now applying for naturalization?

Studying abroad can disrupt ones residency for purposes of citizenship so it is advisable to wait until you have resumed your residency and apply...

What can be done to stop her parents from taking complete control of her life and forcing her to be kep hostage with no privacy?

This is not an immigration law question. Refer to a family law attorney for possible guidance.

Green card application for my sister?

No she will not be okay to remain in the US during the 12-14 year wait period until the visa becomes available.

Will I be unable to file a k-1 fiance visa if my boyfriend was previously denied admittance through us customs on a travel visa?

It is advisable to work with an experienced attorney for guidance with such a filing as it can be done.

Would I be denied green card if my husband and I live separately?

Yes not living together can present problems but this needs to be disclosed at the time of interview. It is best to consult with an attorney for...