失效期

• Applicants should bring the paper i - 797 or the internet generated receipt to the visa interview . when must continuing students ( f - 1 or m - 1 visa categories ) that have begun , but not yet finished their program pay the sevis fee
  更换学校的f - 1学生，如果申请人已严重违反签证法，或签证失效期超过121 - 269天，想请恢复签证身份。