(2) When television first began to expand, very few of the people who had become famous as radio commentators were equally effective on television. Some of the 1 they experienced when they were trying to 2 themselves to the new medium were technical. When working 3 radio, for example, they had become 4 to seeing on 5 of the listener. This 6 of seeing for others means that the 7 has to be very good at talking. 8 all, he has to be able to 9 a continuous sequence of visual images which 10 meaning to the sounds which the listener hears. In the 11 of television, however, the commentator sees 12 with the viewer. His role, therefore, is 13 different. He is there to make 14 that the viewer does not 15 some points of interest, to help him 16 on particular things, and to 17 the images on the television screen. 18 his radio colleague, he must know the 19 of silence and how to use it at those moments 20 the pictures speaks for themselves.