adolescence
1419
3036
activities
adult
african
american
attentive
black
blackboard
boy
caucasian
classes
college
credits
curious
desk
exam
explanation
female
followup
girl
group
indoors
informative
interesting
lectures
lessons
listening
male
man
materials
multiethnic
professor
pupil
scheduled
school
student
studies
subjects
tasks
teacher
teenage
university
watching
white
writing
young