Raziel,
Be frank and be honest. Tell the truth and only the truth.
This is what i said at the end of my interview(an i meant it, honestly)
"I would like to thank the United States. I would like to thank you for your time. If i were back home, i would be speaking with torture, i wouldn't have a chance to say what i said here in front of you. Thank you again. Hundreds of my colleagues and fellow countrymen are being tortured for advocating justice, human rights and democracy. I hope the US stand by them. Thank you."
Well the final thing what the IO asked me was "What's ur long term plan here in the US?"
Then i new it i was approved.
Two weeks after the interview, i went back and collected my grant letter and i-94. From the stamp, i saw that my case was approved on the interview date itself.
Good luck n GOD be with you.