Steam locomotives ____________used in the past.
Steam locomotives_______used today.
The theory of relativity________developed by Albert Einstein.
The first bicycle_____built in 1839.
The radioactive elements radium and polonium______discovered by Marie Curie.
The telephone_______by Alexander Bell in 1875.
The structure of DNA ______in 1953.
The Science Museum ______by hundreds of people every week.
Mechanical clocks______in the 14th century.
What kind of clocks ________in ancient Egypt?
What ______in space research under Korolyov's control?
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