Can gerbils eat cheez-its?

My gerbils are extremely picky and hardly eat anything but the nuts and seeds in their food. I have tried giving them celery, lettuce, grapes, raisins, carrots, baked croissant treats, small pieces of cheddar cheese,and cashews and they all remained untouched! So, I was wondering whether or not it would be safe for them to try cheez-its? What about bread? What are some other household goods that they could try snacking on? Thanks in advance :)