Ключевые слова: aged, back, background, black, blackboard, chalk, chalkboard, class, classroom, college, concept, copybook, education, green, greeting, hand, handwriting, homework, invite, learn, letters, many, meet, nobody, old, paper, piled, read, return, school, selective focus, simple, study, teach, text, university, welcome, white, wood, wooden, word, write,