FAFSA 2008-09 question: What if my parents haven't done their tax for 2007 yet?

All the tax related questions on FAFSA are for the year 2007, which my parents haven't even done their tax. They do have their tax return forms from 2006 though, do I just fill in the 2006 numbers?
Update: I have to turn in my FAFSA by Jan 15, which is the deadline for some of the schools I am applying to.
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