Invention and discoveries
The first electric guitar ( is / was) designed in the USA 1931. Now most Pop and Rock Music is (make/ made) with electric guitars.
Camera phones ( aren't / weren't ) produced until 2000. Now, about 100 million selfies are ( took / taken ) every day!
Gravity ( was / were ) discovered by the English mathematician Isaac Newton. He ( is / was ) hit by falling apple, and started thinking about why that happened.
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