Text 1

　　Every human being has unique arrangement of skin on his fingers and this arrangement is unchangeable. Scientists and experts have proved the 1 of finger-prints and discovered that no 2 similar pattern is 3 from parents to children, 4 nobody knows why this is the 5 .

　　The ridge 6 on a person’ finger doesn’t change 7 growth and is not affected by 8 injuries. Burns, cuts and other damages to the 9 part of the skin will be replaced 10 by a new one which bears the reproduction of the 11 pattern. It is only when the inner skin is injured that the arrangement will be 12 Some criminals make use of this to 13 their own finger-prints 14 this is a dangerous and rare step to 15 .

　　Finger-prints can be made very easily with a printer’s ink. They can be recorded easily. With special method, 16 can be achieved successfully within a short time. 17 the simplicity and economy of this system, finger-print have often been used as a method of solving criminal cases. A 8 man may deny the charge but this may be 19 . His finger-prints can prove who he is even his 20 has been changed by age or accident.

　　Text 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.