Ключевые слова: 1519, 3035, activity, adolescents, adult, african, attention, black, blackboard, boys, caucasian, class, college, credit, curiosity, desks, european, examination, explaining, females, following, girls, group, indoors, information, interest, lecture, lesson, listening, males, man, material, multiethnic, professor, pupils, schedule, school, students, studying, subject, task, teacher, teenagers, university, watching, white, writing, young,