Ключевые слова: application form, asking, background, bill, blackboard, board, chalk, chalkboard, chalky, checkbox, choice, class, classroom, communication, concept, course, dirty, education, election, elementary, enlighten, green, growth, improve, improvement, keyword, knowledge, learn, lesson, literacy, message, no, note, prepschool, school, school year, schooling, skill, student, study, studying, teacher, trainer, university, voting, wallpaper, words, written, yes,