one thing with group projects- they suck. but over the years i have kinda learned how to survive them. first, get to know your group members. just tell them you stutter. then, be a badass. do almost everything of the work for the presentation, so they take you seriously. they will see you are smarter than them and they will stop laughing if they ever was. next,pick something easy to say. im sure like me, all of you know what words and phrases you struggle with. just steer clear of that. or paraphrase the shitty text in your own words. lastly, trust the professors. they are professionals, and im sure they have had a stutterer as a student previously. it doesn't matter if your 'classmates' laugh, you are doing this for the teacher.