Помогите, пожалуйста. Необходимо преобразовать глаголы в скобках в правильную форму Past Simple или Present Perfect.
Ответы
Ответ:
In just over a hundred years, radio has developed into a major form of entertainment and communication. Marconi invented a wireless telegraph system in 1896. This was the birth of radio. Voice transmission started in 1909 following the invention of the valve. Semiconductors have made it possible to develop much smaller, portable radios. The introduction in recent years of digital radios has allowed us to enjoy much better sound quality.
There have been many changes in television too. In the UK, the BBC started daily TV broadcasts in 1936. Colour broadcasts began in the late 1960s. Since the 1970s, satellite broadcasting has allowed viewers a wider choice of programmes. The recent introduction of digital TV has meant better picture and sound quality. Manufacturers have now developed entertainment systems which include television, radio, DVD recorder / player, and computer. The Internet has made it possible to enjoy radio and television from around the world on our PCs.