谢谢爱听鸟.我是菜鸟,请问这些"Form I-797, I-140 approval notice" "G-325A" "Form I-134, Affidavit of Support" "I-797, H4 approval notice with I-94" "Expired DS-2019" 是什么呀,到哪里去找呢?谢谢