Ключевые слова: adult, african, american, back, board, boy, class, classroom, close, college, computer, discussion, education, expert, faculty, girl, group, hand, happy, high, indoors, knowledge, laptop, learn, lesson, listening, male, man, mature, modern, multiethnic, old, people, professor, school, science, senior, student, study, tablet, talking, teacher, teaching, technology, teen, training, university, up, woman, young,