Ключевые слова: alarm, attention, background, beautiful, bell, blackboard, board, brass, call, chalkboard, child, chime, class, classroom, clever, closeup, copy, education, elementary, girl, gold, grader, hand, kid, knowledge, lesson, metal, peal, person, preschool, primary, pupil, ready, recess, retro, ring, ringer, school, schoolgirl, september, shiny, smart, sound, space, student, study, symbol, text, vintage, warn,