30s
activity
adult
attention
audience
auditorium
brainstorming
classroom
communication
concentration
conversation
cooperation
course
debating
discussing
divided
educating
education
emotions
faculty
friendly
group
indoors
information
institute
intelligence
interaction
international
knowledge
learning
lecture
lesson
men
multiethnic
occupation
participants
people
portrait
refresher
schooling
students
studying
together
training
tutorial
university
women
young