The bank account statement is not required while returns are.

This will require a consultation by attorney for proper guidance.

You can attempt to do so if valid exemption exists.

Keeping the passport generally means visa should be issued.

It is advisable to respond by mail if possible.

Best to work with an attorney for guidance.

It can take a few months for NVC to respond.

Yes it is okay to marry while the I140 is pending.

This will require a consultation by an experienced attorney.

You will not be eligible to adjust status if out of status.