Use the appropriate forms of the verbs on the right to

Use the appropriate forms of the verbs on the right to complete the text.

The movie and sound-recording changed popular entertainment in the previous century as they 1)(allow) performances to be reproduced over and over again.But there 2)(be) still another revolution to come.Today we call it broadcasting,and it 3)(bring) entertainment from public places into the home.The telegraph was the first invention that allowed transmission of information over long distances,the telephone allowed transmission of voices by wire.Then the radio 4)(appear).At first only code signals 5)(send) and6) (receive),but soon voice communication 7)(become) also possible.Between 1920 and 1927 several million radio receivers 8)(sell) ,and radio stations 9)(spring) up in many countries,Radio's golden age 10)(run) from 1927 to about 1950 ,the same years as the golden age of movies.Radio programmes 11)(pay) for by sponsors,who 12)(advertise) their goods.They hoped that listeners 13)(respond) by buying their products.