Depending on your qualifications you may be able ot obtain a green card in EB1 status as an alien of exceptional ability. It will be easier though...

You should be fine with a joint sponsor and explain why you did not file.

CAN MY WIFE WITHDRAW HER BROTHERS APPROVED VISA PETITION

yes

My husband is a US citizen and we got married 2011.

You can file all the other forms now. In fact you could have filed them with the I130

I got married to an american citizen a 1yr ago & I'm a resident with a green card what happens if i get a divorce?

Yes you can obtain citizenship after you lift the conditions on permanent residency. You must show that even though you are divorced the marriage...

You should be able to marry and adjust his status with no problem if he netered the US legally on a visa that has expired.

" Class of Submission" I-131 Form, Advance Parole

You cannot file an I131 for somebody who is outside hte United States

Can I enter USA fifty days prior my conditional Green card expires?

depends on how long you will have been outside the US. Hopefully less than 1 year.

Hi , I am on L1 B blanket visa and visa got expired but staying in US with valid I-94. I would like to know if I can apply H1

Yes you probably can apply for H1B as long as you have not been in the US in L status for 6 years.

Regarding STEM-OPT and H1B

There is no such rule but it seems that the international office wants you to use your full opt and apply for the H1B 6 months before its expiration.