Ключевые слова: a, academic, achievement, alphabet, assessment, background, best, black, blackboard, board, chalk, chalkboard, chalked, class, college, copy, design, education, evaluation, exam, excellent, good, grade, grading, illustration, information, kid, knowledge, learn, lesson, letter, mark, object, perfect, plus, pupil, result, school, space, student, study, success, symbol, system, teach, teacher, test, text, white, write,