Keywords
30 to 34 years, 40 to 49 years, 45 to 49 years, adult, adult education, attentive, caucasian, class, classroom, college, day, diversity, educate, educating, education, ethnic, facial expression, female, five people, group, group of people, head and shoulders, headshot, indoors, learning, lecture, listening, male, man, mature adult, mature student, mature woman, mid adult, mid adult man, mix, mixed, mixed race, multi ethnic, multi-ethnic, multi-ethnic group, paying attention, public services, school, senses, small group of people, smiling, social institution, sound, student, university, white, woman, stock image, images, royalty free photo, stock photos, stock photograph, stock photographs, picture, pictures, graphic, graphics, fine art prints, print, poster, posters, mural, wall murals, is099qt1r