Graham Bell is the .................of the telephone.
inventor
Marie Curie ............. radioactivity.
discovered
America ................... by Cristopher Colombus.
was discovered
Lightbulb is the .................... of Thomas Edison.
invention
German........ Johannes Gutenberg invented modern printing press.
inventor
The first compass .......... in China during Han Dynasty.
was invented.
Wright Brothers are considered the ......... of airplane.
inventor
One of the most important work of Isaac Newton was the ............ of gravity.
Discovery.
James watson and Francis Crick's work led to ........... of DNA in 1953.
discovery
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
Even though Gunpowder ............in China, its date is unknown.
invented
Even though its ............. dates back to 6th century, chess has not change throughout history.
invention
Even though Edwin Drake ............petrol, he was unaware of its potential usage
discovered
The ............of first automobile Karl Benz's work increased people's mobility and freedom.
inventor
