Your I-94 will be sufficient without the passport admission stamp.

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When can I apply for citizenship? After 3 or 5 years????

Since your wife is deceased, 5 years from your initial admission as a Lawful Permanent Resident.

Imigration attorney

You've posted this 4 times now. Please see my response to your 4th post.

Imigration attorney

You've posted this three times now. Please see my answer to your subsequent questions.

Imigration attorney

Please see my answer to your subsequent question on this.

Imigration attorney

Your facts are unclear. If a "Lawyer" misrepresented her service, then consider filing a complaint against her. If an I-130 was the only form...

Traveling dates on I-131 Advance Parole form and reason for traveling (marriage-based green card application, AOS from o-1 visa)

I don't know why the form bothers with these dates because USCIS will issue the Advance Parole for multiple entries at any time. So, yes, it's...

Criminal history for marriage-based green card, AOS from O-1 visa

Not for adjustment of status, only if you will be applying at the consulate.

If she is undocumented, she is subject to deportation. The Department of Homeland Security set priorities for deportation this year and she should...

Affidavit of support question regarding income requirement and poverty guide line and liquid assets.

You seem to be on the right track but if you want this done correctly with the evidence presented the right way to USCIS, you should consult with...