Ключевые слова: abstract, adult, app, background, button, classroom, college, competence, concept, design, email, employment, experience, female, flat, graphic, icon, internet, isolated, job, knowledge, laptop, lesson, marketing, media, mobile, person, pointer, profession, professionalism, qualification, responsibility, retro, school, schoolboy, schooling, set, shadow, shopping, sign, simple, skills, specialty, style, tablet, teacher, teaching, textbook, web,