Ключевые слова: 1617 years, 67 years, 89 years, academic, african ethnicity, answering, assisting, attentive, bench, black, boy, boys, casual clothing, caucasian, caucasian ethnicity, child, childhood, classmate, classroom, concentration, desk, development, education, elementary, explaining, female, focused, girl, girls, guidance, hand raised, indoors, information, innocence, intelligence, intelligent, knowledge, lifestyle, male, mixedrace, mixedrace person, notebook, school, school kid, schoolboy, schoolgirl, schoolmaster, schoolteacher, student, teaching, teenage girls, teenager, three people, wisdom,