Ключевые слова: back, blackboard, board, boys, caucasian, children, class, classroom, colleagues, competent, education, elementary school, experienced, friendly, german, germany, girls, giving, grammar school, handing, happy, learning, lesson, listening, man, occupation, paper, papers, people, person, primary school, profession, pupil, room, school, schoolboy, schoolgirl, stem, student, students, studying, teacher, teaching, tuition, work, working,