Ключевые слова: academic, announcement, back, blackboard, board, business, calendar, chalk, classroom, course, day, design, do, drawing, duty, education, educational, event, holiday, homework, international, learning, lesson, list, management, meeting, month, monthly, note, organizer, plan, planner, post, reminder, schedule, scheduler, school, semester, solution, student, study, task, teacher, timetable, training, week, welcome, work, world, write,