I am currently on L1B in US. Could you please let me know if it is legal to resign on L1B while am in US or is it required by law that I need to return to my home country and resign? Am on US payroll and I believe am governed by US labour laws and they will supersede the Indian laws even if I signed a document mentioning that I will return to India. Could you please confirm?

I am currently a PhD student and preparing for application for OPT. Previously in 2004 upon earning BS degree, I got OPT and worked for a summer. In preparation for a new OPT, I realized that I need to provide copy of front and back of the previous EAD card. However, I cannot find the card. I just found copy of I-765, I-94, and I-20 for the previous OPT.If I submit without copy of the previous EAD card, will I be likely to be denied for the new OPT?
Also, what is the safest way to deal with this situation.

I have student visa and want to come to the US earlier than that 30 days allowed period of time.Probably one month earlier.Can I enter on visa waiver and before school starts re-enter the US by going to mexico or canada to activate the student visa? (which i was told i need to do).if i do so,do i need to buy one way or round trip ticket since i do not need to go nack to europe to re enter the US and how do i explain it to the immigration officer that i only have one way ticket? a while ago i learned i need to obtain change of classification and fill form I539 which takes months.is that so?

What would be derivative's status during the interim between the final divorce and the 485 is adjudicated/denied? Is it true s/he is still on AOS until the 485 is adjudicated?

If you have a valid LPR and you went and stayed over 2 years in the philippines and you want to come back here. If you don't have a re-entry permit how can you get a re-entry permit?