今天收到移民局关于485补件的正式信函，内容如下：
please submit evidence of your employment authorization from August 1,2010 to present, such evidence may include :
1)employment authorization documents(forms I-688 or I-766) granted to you by this service;
2)form I-797 approval notices, showing you were granted status in an employment-authorized nonimmigrant classification
我的情况是今年7月31日，H1 3年到期，已经申请延期，目前状态是pending, 还没收到approval notice; 绿卡类型： EB1b, 学校support.
我想请教的问题是：
1． 什么是 employment authorization documents(forms I-688 or I-766)？
2． 移民局要的form I-797 approval notices，是否就是H1 approval notice? 现在如果让学校出示一个证明我的H1 pending 状态是否可以？
谢谢老师的回答。