Complete the text about developments in radio and television. Put the verbs in brackets in the correct form: Past Simple or Present Perfect. In just over a hundred years, radio 1(develop) into a major form of entertainment and communication. Marconi 2(invent) a wireless telegraph system in 1896. This 3(be) the birth of radio.Voice transmission 4(start) in 1909 following the invention of the valve.

Semiconductors 5(make) it possible to develop much smaller, portable radios. The introduction in recent years of digital radios 6(allow) us to enjoy much better sound quality.

There 7 (be) many changes in television too. In the UK, the BBC 8(start) daily TV broadcasts in 1936.Colour broadcasts 9 (begin) in the late 1960s. Since the 1970s satellite broadcasting 10(allow) viewers a wider choice of programmes. The recent introduction of digital TV 11(mean) better picture and sound quality. Manufacturers now 12(develop) entertainment systems which include television, radio, DVD recorder / player, and computer. The Internet 13(make) it possible to enjoy radio and television from around the world on our PCs.