Is there any grace to admit into second masters after OPT expiration?

The visa expiration and OPT/status expiration are two different things. Generally, the grace period extends beyond the expiration of the OPT. ...

Can I be remove from I-864?

Only a green card holder or a US citizen can be an obligor on an affidavit of support.

Hello I just get a letter from homelands security about a G56 notice review for my naturazation citizens chip what does that ??

That could be for any number of reasons. Consult with an attorney to discuss your case.

Which eligibility category in I-765 while in TPS?

The eligibility categories are listed on the I-765 instruction sheet at www.uscis.gov.

Yes, it is possible that a conversation with a USCIS officer over the telephone could trigger an RFE.

Consult with an attorney to discuss your options. The attorney will need to read the decision to properly advise you and your employer.

Yes, you can include records of legal admission and stays in the US.

Uscis cancelled interview. Why? Case is not ready to be sealed?

Sealed? That does not make any sense at all.

Green card through the marriage?

It should not be taking so long. Consult with an attorney for options.

2 H1B's picked in Lottery. 1 is approved and other is at RFE. What's the impact of 2nd H1B approval/denial on 1st Approved H1b?

It will depend on the reason for any denial, it may have no impact on your already approved petition.