Ключевые слова: 21, 2106, 21st, abstract, appointment, background, blank, board, business, calendar, concept, daily, date, day, deadline, design, diary, event, first, idea, important, jun, june, meeting, memory, message, month, monthly, number, object, one, organize, organizer, page, plank, planner, remember, remind, reminder, rope, sign, skateboard, skateboarding, summer, symbol, time, today, twenty, week, wooden,