Ключевые слова: announcement, back to school, background, black, black board, black color, blackboard, blank, board, border, chalk, chalk board, chalkboard, chalkboard visual aid, class, classroom, college, communicate, copy, copy space, copyspace, dirty, draw, educate, education, elementary, empty, equipment, erase, frame, green, grunge, horizontal, learn, lesson, mark, messy, no people, school, schoolboard, scratched, scribble, space, study, teaching, texture, unclean, write,