The first successful vaccine against polio was developed ______., in 1950s, in the 1950s, on the 1950s, in the 1950th, The Great Fire of London destroyed much of the city ______., in 1666, in 1666s, on 1666, in the 1666, Gothic cathedrals became popular across Europe ______., in the 12th centurys, on the 12th century, in the 12th century, in 12th century, The first iPhone was introduced to the public ______., on 9th of January, 2007, in the 9th of January, 2007, in 9th of January, 2007, on the 9th of January, 2007, Environmental movements gained international attention ______., in the 1970th, in 1970s, in the 1970s, on the 1970s, The first universities in Europe were established ______., in the Middles Ages, in Middle Ages, on the Middle Ages, in the Middle Ages, The Beatles became one of the world’s most famous bands ______., in the 1960th, in the 1960s, in 1960s, on the 1960s, The American Civil War began ______., in 1861, on 1861, in 1861s, in the 1861, Scientists made important advances in astronomy ______ using powerful telescopes., in the 17th centurys, in the 17th century, in 17th century, on the 17th century, The first episode of Friends aired ______., on the 22nd of September, 1994, in the 22nd of September, 1994, on 22nd of September, 1994, in 22nd of September, 1994, Air travel became affordable for many families ______., in the 1980th, in 1980s, on the 1980s, in the 1980s, The Magna Carta was signed by King John ______., in 1215s, in the 1215, in 1215, on 1215, Impressionist painters transformed European art ______., in the 19th centurys, on the 19th century, in the 19th century, in 19th century, Streaming services completely changed the entertainment industry ______., on the 2010s, in the 2010s, in 2010s, in the 2010th, The first successful flight by the Wright brothers took place ______., in 17th of December, 1903, on 17th of December, 1903, in the 17th of December, 1903, on the 17th of December, 1903, Ancient Egyptian civilization flourished for thousands of years ______., in ancient times, on the ancient times, on ancient times, in the ancient times, The World Wide Web was invented by Tim Berners-Lee ______., in the 1989, on 1989, in 1989s, in 1989, Punk rock emerged as a reaction against mainstream music ______., on the 1970s, in the 1970s, in the 1970th, in 1970s, The first modern skyscrapers were constructed in major cities ______., in the late 19th century, on the late 19th century, in the late 19th centurys, in late 19th century, The United Nations was officially founded ______., on 24th of October, 1945, in the 24th of October, 1945, on the 24th of October, 1945, in 24th of October, 1945

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