¿Donde trabaja el, ella?  - Where does he, she work?

To answer that question, an example would be....La secretaria trabaja en la oficina which means The secretary works in the office.

So these are some of the places of work....

El banco - the bank .....El contador trabaja en el banco
                                      The accountant works in the bank

La iglesia - the church... El pastor trabaja en la iglesia
                                           The pastor works in the church

La escuela - the school .... La profesora trabaja en la escuela
                                            The teacher (f) works in the school

El hospital - the hospital.... El medico trabaja en el hospital
                                              The doctor (m) works in the hospital

Other places of work are....

El parlamento - courthouse
La granja - farm 
El restaurante - restaurant
El aeropuerto - airport
La estacion de policia - police station

Please remember that (f) means feminine or female and (m) means masculine or male. (Pl) means plural .