Aclown works at a circus.he makes people laugh. 1.teacher/shool/teach students.2.greengrocer/greengrocer's/sell fruit and vegetables.3.postman/post office/take letters to people's houses.4.waiter/cafe/serve people/ p.s. 25 !

A teacher works at a school.
He teaches his students.
A greengrocer works at a Greengrocer's.
He sells fruit and vegetables.
A postman works at a post office.
He takes letters to people's houses.
A waiter works at a restaurant (cafe).
He serves people.