It the form says that the last entry, you need to put new

visa. I-94 you only have one, you have not choice. However, visa status, you have many based on the changed situation. As far as N/A is considered, I said if you are in America, you do not need to put something here. If you want to go back to China, you can do that. But I believe that you will not choice China to get your GC.