1518
activity
adolescents
african
black
blackboard
boys
caucasian
class
classmates
collaborating
college
desks
divided
educational
enjoying
european
exercise
females
friends
girls
group
helping
indoors
information
interest
lesson
males
method
multiethnic
project
pupils
school
skill
split
students
studying
talking
task
technique
teenagers
time
training
university
white
working
young
youth