Machu Picchu _________(remain) unknown if Hiram Bingham ________ (not explore) the Andes in Peru., If the 'I love you' virus _________ (be) found earlier, forty-five million computers _______ (not crash) in 2000., The development of modern medicine _________ (be) different if Alexander Fleming _________ (not discover) penicillin. , If John Lennon _________ (not meet) Paul McCartney, they __________ (not form) The Beatles., The invention of the mobile phone __________ (not be) possible if Alexander Graham Bell _________ (not invent) the telephone., If the Nestor Film Company ___________ (not open) a film studio there in 1911, Hollywood _______ (remain) a quiet town..

3rd conditional - Unit 9.1

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