1。出境时需同时交出原来入境时的I-94和新批准的I-797上的I-94吗？
-Only the last one (I-797 I-94).
2。入境时，办新I-94需要什么证明文件？
-Same as you did before from Canada to US: passport, latest three month paycheck stubs or employment verification letter from the employer, the H1 approval notice.
I-797A上写 “The petitioner should keep the upper portion of this notice." 所以，入境时，是否出示I-797A的复印件及下半联左侧的原件就够了？
-Fine.
3.如用EAD/AP卡入境，将来如何回到H1B身份？
-Extend the H1 in US or go outside US and reenter US.
谢谢
