Can I file H-1B based on I-140 (priority date Jan-08, retrogressed at the moment)? I've been outside US for more than 7 years

Generally, an H beyond the 6 year limit expires unless an approved I-140 is filed before the 6 year limit is reached.

B is only a bridge if A is withdrawn other wise employer C may file A to C.

L1-B or L1-A or any other visa ?

1) yes, it is possible; 2) the filing of a L extension will authorize your continued stay. The filing of an immigrant petition itself would not....

How long does it take to receive the permanent resident card by mail?

If you obtained the green card through adjustment in the US. it is a fairly consistent 45 day delivery. if you made an immigrant admission green...

E3 Renewal Reentering the US

In general, a person with a current E-3 visa and passport may renew their E-3 abroad and return to the US to continue prior authorized E-3 employment.

In this situation will there be a problem in getting a green card?

you should only stick around and marry him if you have a real relationship.

1) How many years i can stay on H1b visa in this scenario 2) can i go back to company "A" when my priority data become current

Should company A not withdraw the I-140 and continue to offer you permanent employment you could return to A. H1B employment may be extended until...

Is it easier or better if she applies when shes single than being married and will my record affect her application?

if she wishes her married name on the naturalization certificate, married would be better.

How do I fill out the n-400 1 A & B) address section to correctly show my physical address and not confuse USCIS?

Please note you must reside in the jurisdiction of the office adjudicating your naturalization at the time of filing.

Complicated adjustment of status.

if in deportation should consult an experienced immigration attorney to assist her and her husband with an I-130 petition and adjustment of status