Ключевые слова: american, bored, boy, child, children, class, classmate, classroom, cognition, desk, educational, elementary, emotion, european, frustrated, german, homework, indifference, indoors, kid, knowledge, learn, learner, lesson, male, mistake, offended, person, portrait, primary, pupil, resentful, russian, sad, school, schoolboy, schoolchild, schooling, schoolkid, study, teenage, teenager, thoughtful, tiredness, trouble, unhappy, upset, youth,