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Dear CA, Thank you for your comment.
I went to Immigraton office about 10:00 a.m. on Dec 3, as you said there were only two persons waiting. Aa officer did not take a look at my designated date and time. I finished evenrything in thirty minutes. one of my friends told me that he went last june and there were too many people. So i guess in winter time, not many people apply green cards. Anyway, thank you again.