Ключевые слова: adult, african, american, background, book, business, caucasian, cheerful, class, classmates, classroom, college, computer, copy space, desk, education, ethnic, ethnicity, female, friends, group, happiness, happy, hispanic, horizontal, indoors, knowledge, learning, multiethnic, outdoors, people, pupil, school, sitting, smiling, student, studying, technology, teenage, teenager, together, university, wooden, workplace, young,