Alot of advice on how to address the stutter. Also I'd say to give brief answers. Some questions may be like what is the reason for your stay in the US....typically business or pleasure. Simple questions, simple answers. Be prepared for possible wait times. I've gotten through quickly sometimes, while others took up to 3hrs for processing. One time it cost me the ride I had scheduled from the airport. So make sure there is some wiggle room for arrival plans.