8老师请问:
给父母申请绿卡材料递送哪种方式比较好,USPS还是FEDEX? -Either is OK.
用USPS是发到芝加哥中心那个P.O.BOX,但CEITIFIED MAIL也可以发到P.O.BOX吗?不是需要人签收吗?谢谢 -Express mail cannot be sent to the PO box, no matter it is deleviered by USPS or FedEx. Read the Instructions.