Ключевые слова: alarm, background, blackboard, boy, break, child, children, clever, clock, concept, deadline, early, education, elementary, exam, excellent, face, friendship, grow, happy, hard, kid, kids, late, lazy, learn, learning, lesson, little, mark, oversleep, preschooler, problem, pupil, school, schoolboy, schoolchild, schoolchildren, schooler, schooling, schoolkid, science, student, talented, teen, teenager, time, timer, up, waking,