On I-130, I-485, etc, middle name shouldbe N/A, none, or just leave blank?

gund

Registered Users (C)
Not sure what I should put in the middle name field. I don't have a middle name.

I'm a little afraid of putting "none", they may think that's my middle name. Putting "N/A" some guy may think it's "nia".

Then I read elsewhere leaving it blank is bad.

Simple question, giving me headaches.

Also should I put "0" for dependents and etc in I-864 or just leave blank?

Sorry for the basic question.
 
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