E.g Who works in a school? A teacher works in a school. 1- Who works in a hospital? 2- Who works in a police station? 3- Who checks your teeth? 4- Who works in a post office? 5- Who flies a plane? 6- Who works in a shop? 7- Who works in a factory? 8- Who brings your letters? 9- Who sings songs? 10-Who acts in films?