academic
adult
algebra
background
beautiful
blackboard
casual
caucasian
chalk
chalkboard
class
classic
classroom
college
crossed
cute
difficult
education
educational
equation
explain
hands
information
isolated
knowledge
learn
lesson
male
man
mathematical
mature
middleaged
notes
occupation
person
professor
pupil
school
senior
smart
student
study
studying
suit
task
teach
teacher
university
white
work