adult
blackboard
business
businessman
businesswoman
caucasian
class
classroom
communication
conference
consultant
consultation
cooperation
discussion
education
females
group
hand
human
indoors
instructor
job
leadership
lecture
male
man
manager
meeting
men
occupation
office
people
personal
pointing
presentation
room
seminar
serious
showing
speech
talking
teacher
teaching
team
teamwork
training
working