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Lectricity the name came from the greek word for amber and was coined by elizabeth i's physician william gilbert who was among those who noticed that amber had the power to attract light objects after being rubbed. in the 19th century such great names as michael faraday, humphry davy, alessandro volta and andre marie ampere all did vital work on electricity. photography (early 19th century) leonardo da vinci had described the camera obscura photographic principle as early as 1515. but it was not until 1835 that frenchman louis daguerre produced camera photography. the system was gradually refined over the years, to the joy of happy snappers and the despair of those who had to wade through friends' endless holiday pictures. telephone (1876) edinburgh-born scientist alexander graham bell patented his invention of the telephone in 1876. the following year, the great american inventor thomas edison produced the first working telephone. with telephones soon becoming rapidly available, the days of letter-writing became numbered.
1. i don't know (present inefinite -active voice)what the time is(present form of verb to be -active voice )now as my watch has stopped.( present perfect -active voice ) 2. the typist had typed(past perfect -active voice ) all the letters before the manager came(past indefinite -active voice ) 3. i shall be preparing (future continious -active voice )for my examinations in may. 4. science in russia has made( present perfect -active voice ) enomorous progress since the beginning of the century. 5. they informed(past indefinite -active voice ) us that they had charted (past indefinite -active voice )the steamer "minsk" for the transportation of the goods.
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