Ключевые слова: background, backpack, bag, book, books, boy, campus, caucasian, cellphone, cellular, chatting, college, communication, copyspace, course, device, education, handsome, happiness, happy, intelligent, internet, isolated, learn, learning, man, message, mobile, model, online, phone, positive, school, smartphone, smile, smiling, standing, student, studying, teaching, technology, teen, teenager, telephone, training, typing, using, young, youth,