Listening.

Adam is babysitting for his little sister.

The boy is reading about different jobs.

An archtect helps sick people.

A teacher teaches adults.

A secretary doesn't work in an office.

A dentist repair people's teeth.

A doctor helps healthy people.

A nurse helps a doctor.

A vet helps sick animals and people.

Adam wants to be a firefighter.

Adam's brother wants to become a police officer.

Adam would like to be a policeman.