The first black-and-white nine-by-twelve inch TV sets
In a surprisingly short time
1. has been replaced by colour
2. the development of TV became
3. At present 3. were of historical importance
4. Satellite and cable TV makes 4. television has had great influ-
5. Recently black-and-white TV 5. is the most important stage in
the development of TV since the appearance of colour television.
6. The next major advance in 6. to watch TV programs in dif-
ferent parts of the country and throughout the world.
7. The invention of high-defini- 7. there are different kinds of tele-
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