What should I do if the USCIS ask for more evidence to prove of my bona fide marriage?

My wife and I were married April 2012, when we got married we did not expect that my papers would be discontinued. After 6 months later we filed for my green card so I will be able to stay here. I got approved but it is a conditional status for 2 years. My 2 years anniversary of being a conditional resident came in this year and we filed for I-751 on January 2015 (including evidence such as: Electricity bills, apartment leases with both our names in it, our Tax returns, my car insurance that has her name in it.) We thought those evidence would be enough but we got a mail from them asking for more evidence and we have until August 18 to provide more evidence. All that we can really provide are those evidence that we sent them, and the only thing we forgot to put are our pictures for the past 2 years. My wife and I are planning on sending those pictures and an affidavit that explaining to the USICS that we are only college students and we were not able to provide the things that they were asking, which are (birth certificate of children, Mortgage of house, car payments that has our names in it, and also bank accounts together.) We don t have those forms because we were just renting a place together, we were not ready for kids at all, and we did not buy a car because we do not have money for it, and also we did not think of sharing bank accounts.) I am worried that I might get deported. What should I do? I have been here for 10 years already is there other ways?

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