20s
30s
answer
answering
attentive
caucasian
chairs
class
classroom
college
communication
concentration
copy space
desk
doubt
education
educator
explaining
female
focused
indoors
information
institute
job
knowledge
learn
learning
lecture
lesson
listening
male
man
mid adult
mixedrace
question
raised hand
school
sitting
standing
student
students
study
studying
table
teacher
teaching
university
whiteboard
woman
young adult