America ................... by Cristopher Colombus.
was discovered
Marie Curie ............. radioactivity.
discovered
Before the ...........of plane, wright brothers made a lot of unsuccesfull attempt.
invention
After the .............of modern printing press,a huge amount of books were written in Europe.
invention
Lightbulb is the .................... of Thomas Edison.
invention
One of the most important work of Isaac Newton was the ............ of gravity.
Discovery.
Even though Gunpowder ............in China, its date is unknown.
invented
German........ Johannes Gutenberg invented modern printing press.
inventor
James watson and Francis Crick's work led to ........... of DNA in 1953.
discovery
Wright Brothers are considered the ......... of airplane.
inventor
First vaccination to protect people from diseases .......... by Edward Jenner.
was invented
The ............of first automobile Karl Benz's work increased people's mobility and freedom.
inventor
Even though its ............. dates back to 6th century, chess has not change throughout history.
invention
The first compass .......... in China during Han Dynasty.
was invented.
Graham Bell is the .................of the telephone.
inventor
Even though Edwin Drake ............petrol, he was unaware of its potential usage
discovered
..............of computer dates back to 1939.
invention