There are popular programmes about the work of the police on TV.  People like them because they are interesting and useful. In London there is a TV programme called "Police Five". It takes five minutes a week.A TV reporter talks about crimes  in London. He asks people for help, because the police station needs their help. The TV reporter shows picture of lost painting, lost cars and other lost things during the week. Sometimes he shows the picture of the car that the thieves  drove away. When people see the picture of such things on TV, they may remember something so that they may tell the police where or when they saw them. With their help the police may catch more thieves. Sometimes the police find a car or something expensive that has ever been lost, the TV reporter shows them on TV. Then the owners may see them and they can get them back. The police   _  by this programme.
let people understand them ask for people's help let people know what was lost let people feel interesting