Ключевые слова: back, background, begin, beginning, black, blackboard, blank, board, chalk, chalkboard, class, close, communication, concept, copy, copyspace, drawing, dust, dusty, educate, education, empty, erase, eraser, handwriting, learn, learning, lesson, marks, message, new, note, old, powder, school, sign, space, start, student, symbol, teach, teacher, teaching, text, texture, up, used, white, write,