adult
answer
arms
ask
back
blackboard
boys
caucasian
chairs
child
children
classroom
concept
conducting
educate
education
educator
explain
geometry
gesture
girls
hand
hands
kids
knowledge
learn
learning
lesson
male
man
math
people
positive
primary
profession
pupils
raised
school
secondary
sitting
student
study
subject
task
teach
teacher
teaching
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tutor
work