19
adults
back to school
backpack
boy
caucasian
college
corona
corridor
covid
covid 19
covid19
distance
education
elbow bump
face mask
females
friends
friendship
front view
girl
greeting
group
hallway
illness
indoors
inside
learning
males
man
pandemic
people
prevention
protection
reopening
safe
school
standing
studying
university
virus
woman
young
youth