Read the text and fill in the gaps.

BBC World Service radio broadcasts ... . By the early 21st century the service broadcast in more than 40 languages to roughly 120 million people worldwide. World Service Television began broadcasting in 1991 and unveiled a 24-hour news channel, BBC News 24, in 1997. The BBC also ... of its television programming. In the United States, series such as All Creatures Great and Small, Doctor Who, Mr Bean, and Upstairs, Downstairs have been featured on the Public Broadcasting Service.
The BBC ... by annual television licensing fees, which are paid by those who own TV sets or watch live television transmissions on such devices as computers. It offers five radio networks in Britain, ... , as well as national television channels. Under its charter, the BBC may not advertise or broadcast sponsored programs. It is required to refrain from broadcasting any opinion of its own on current affairs and matters of public policy and to be ... .