adolescence
1619
3034
activities
adult
african
american
attentive
black
boy
caucasian
classes
college
complicated
credits
curious
desk
difficulty
exam
explanation
female
girl
indoors
informative
interesting
lectures
lessons
listening
male
man
multiethnic
problems
professor
pupil
question
questions
revise
school
student
tasks
teacher
teenage
testing
university
white
writing
young
youths