1216
activity
adult
afroamerican
answering
boy
casual
caucasian
chalkboard
children
class
communication
course
different
diligence
education
effort
elementary
ethnicity
european
exam
explanation
girl
giving
group
happy
indoor
kids
learning
lesson
many
math
mixed
multiethnic
notes
people
portrait
positive
pupil
school
science
sitting
smiling
students
studying
taking
teacher
teenage
together