回複：回複：回複：回複：回複：why mom need to go to Shanghai for interview (app

1. the old expired passport (my mom got her new passport in 2008, before 2008, she used her old expired passport which has two B-2 visas); This time, she used her new passport, which also has one B-2 visa.

2. B-2 extension document: my mom never applied for B-2 extension in the U.S. Every time she went back to China within 6 months.

 -Explain it to the VO if asked durng the interview.

So my mom just needs to take the old expired passport for the interview. Nothing else, right?

-Yes plus all the documents needed for the visa application such as new passport, photos, payment receipt, etc.