Ключевые слова: ad, advertisement, advertising, advice, announcement, arrow, arrowhead, ascension, ascent, background, blackboard, blank, blankness, board, bulletin, chalk, chalkboard, circular, classroom, climate, current, education, flat, glass, go up, lacunae, line, market, notice, notification, pattern, placard, plank, proclamation, publicity, rally, rise, school, schoolroom, share, stock, streak, teaching, tendency, texture, trend, wood, wooden, write,