Réponse :
A police man has to protect population by arresting bad people who steal, do murders or crimes.
A teacher has to teach kids different lessons of different themes to make kids become good and intelligent people.
A cleaner has to clean dirt in publics (police offices, schools, sport stadiums...) or private places (houses, private offices...).
A doctor has to take care of people who need it and heal them when they are sick.
