update:
it happened that the IO didn't ask us anything quizzing, he just looked over
our lease, bank accounts, phone bill (family plan)
he basically asked whether we have any previous marriages, any children from
any relationships, where did we get marry and how we conduct the ceremony,
do we have credit cards together, what are we doing for a living, also asked
when did we come to america, what does our parents do, do we have any
wedding pictures with us (we showed him pictures on our facebook