Ключевые слова: adolescent, are, audience, boy, brother, business suit, businessperson, caucasian, child, childhood, class, classroom, collaboration, conference, confident, corporate, delivering a presentation, education, kid, leadership, lecture, lecturer, male, microphone, person, presentation, preteen, professional, public speaking, schoolboy, seminar, speech, stage, student, study, success, teaching, team work, tie, white, young,