非常感谢您指导我们，帮我们纠正理解。很感激！我们还有一些小问题，敬请8老师再指点：
1. 944表，关于父母教育背景，他们都是大学毕业，但是已经退休多年，现在他们没有把他们的毕业证书带来，关于page11, part4, item3, "Degree/Certificate "可以空着吗？然后在18页解释一下？
Page12, part4, item4, "do you have any occupational skills " 可以选NO吗？他们已经退休多年，不准备工作了，还需要解释吗？
2. 485表，ok to print out I94 directly from the website? (It doesn't look very professional when I tried to print it out directly from the website)
3. I had A number for green card. Now I'm citizen, should I still fill in A number in those forms?
4. Hope to confirm that it's ok to wait to submit I693 (体检表)?
5. 父母的无犯罪记录需要交吗？
再次感谢您8老师的帮助！祝福您和家人！