Задание: Образуйте страдательный залог.

The weight of the
planets ... (to calculate) by Newton as a young man.
The concept of
relativity ... (to propose) by Albert Einstein in 1905.
Most Cambridge
colleges ... (to found) as schools of theology but in 1750 under the
influence of Sir Isaak Newton, mathematics became compulsory and the main
subject of study.
The first motor car
... (to make) in 1875 by an Austrian Siegfried Marcus. He used the
internal combustion engine, which ... (to perfect) gradually.
The earliest motor
cars ... (to build) like horse carriages and an early British company ...
(to call) the Greatest Horseless Carriage Company.
The Rolls-Royce
motor car long ... (to know) as the best car in the world.
Water ... (to
discover) under the Sakhara Desert.
Diamonds ... (to
find) in South Africa in the 19th century.
The electric battery
... (to invent) by Luigi Galvan in 1786.
The craters on the
moon ... (to cause) probably by meteors.
Gold, silver and
copper ... (to value) for their luster.