My AOS interview's coming up! Help!

[sweedie]

I'm adjusting status because i was selected for the green card lottery. I'm married, but my husband is not applying with me, he already have a work visa, and his job will apply for him later on (we couldnt afford both at the same time)

Now, i got the appointment for my AOS interview!! Im so nervous! What kinds of questions will they ask?
They also send me a letter stating i have to bring my husband and photos of our wedding and married life. why? He is not applying with me and the green card is not marriage based!

The interview is next friday, im happy for any kinds of replies!

Thanks, johanna