for H1b extension (2nd three years), without dependents, in US, working now, never changed university/position/job title
最重要的两问题：
１。请问我是该file DS－１５６还是I－１２９？ file fee $320?
２。 申请发给谁？the visa office of state department?
Thank you all.
上网已搜到的清单:
(有谁自我申请过，能不能告诉我if the list is complete?)
• A valid passport
• The original I-94
• A letter of support from the applicant’s employer.
• DS-156. passport-size photograph
• Filing fee.
• A self-addressed or stamped envelope for the return of passports.
• USCIS Form I-797
• W2