回複：Thank you Pijiang! I studied your textbook. It helps. However

I am wondering if it will affect my green card approval once I changed from I485 to CP.My I140 was approved based on NIW. If I take a job in China, won't I lose the resasons for NIW?

How do I response to RFE and show proof of holding a similar position as claimed in NIW?
- You need to prove that there is a permanent position waiting for you in US, which is the ground of your GC application.