我是两年临时绿卡, 11月1号到期,我9月8日填写I-751申请十年绿卡, 10月1日收到I-797,It is said, your conditional resident status extented for a period of one year,. During the one-year extention you are authorized employment and travel, 请问, 我12月能回国吗?需要随身携带什么文件?护照, 过期临时绿卡, I-791 ? 我 需要到移民局去在护照上盖什么章吗?