about EB-1b greencard

all teachers,

I submitte my greencard application (I-140 and I-485 together, EB1b, outstanding researcher, sponsored by the university. the receive date of I-485 is 02/24/2014), and received the greencard at May, It has 90 days by this time for the green card. but the the I-485 has exceed 180 days now!

so I have some questions about my green card:

1. I heard that I have to  do research work for my boss, or the employer (university, actually my boss and office of university sign the I-140 on the behalf of me)  for at least 180 day to the November? is this is the law?

2. if I will be fired by my boss (the employer is university), the employer (the university) can require or force the USCIS to cancel my greencard at this time?

3. if I will be laid off at this time, can I find another type of job? I really want to find different job!

thanks a lot