Ключевые слова: 20s, adolescence, adolescent, adult, answer, arm, ask, attention, attractive, casual, caucasian, class, classmates, classroom, clever, close, close up, college, concentration, desk, education, educator, female, girl, grade, group, hand, highschool, job, knowledge, large, learn, lesson, lift, male, many, pick, pull, question, quiz, row, smart, students, study, studying, teacher, training, up, white, woman,