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8老师好，我于8月20日递交了I751婚姻绿卡二转十，9月24日看到支票已经兑现，然而直到现在还没有收到receipt notice,
-You can find the receipt number from the cleared check and call USCIS to see whether they mailed the receipt notice out or not. 

眼看下个星期绿卡就要到期了，我该如何做，感谢8老师
-Because you filed I-751 before your conditional green card expired, your green card status is automatically extended for another one year. You don't need to do anything. If you want to travel out of US, you just bring your passport and the I-751 filing receipt to the local USCIS Office to get the green card stamp.