全家刚拿到绿卡，有几个问题请教 ：
１，准备下周去趟加拿大，请问持绿卡如加拿大境后，一般允许在加境内呆多久？
-6 months is the most Canada allows for visitors. But you must show that you have enough money to support yourself for the entire period of time of yoru stay e.g. 6 months - and that you have proof that you WILL GO HOME/back to US at the end of your visit. If you cannot show these proofs or the money, you will be denied entry to Canada.
２，持绿卡除了加拿大，墨西哥之外，还有哪些国家／地区可以免签？
-I don't know.
２，原来的Ｈ１Ｂ／Ｈ４算是自动作废了吧？
-Correct.
３， 手上的Ｉ－９４，应该怎样处理？
-Up to you. It is suseless.
