What if the asteroid had missed Earth 66 million years ago? (dinosaurs / continue to evolve), What if the ancient Library of Alexandria hadn't burned down? (modern science / develop centuries earlier), What if the Wright brothers had failed to invent the airplane in 1903? (international travel / rely on steamships for much longer), What if Alexander the Great hadn't died at the young age of 32? (his empire / expand into western Europe), What if Alexander Fleming had cleaned his lab dishes and never discovered penicillin in 1928? (millions of people / die from minor infections., What if Johannes Gutenberg had never invented the printing press? (books / remain a luxury item for the ultra-rich), What if the internet had been invented in the 19th century during the Victorian era? (people / send emails via telegraph networks), What if Columbus's ships had sunk before reaching the Americas? (European colonization of the Americas / start much later), What if Hernán Cortés and his army had been defeated by the Aztecs? (Mexico / retain its indigenous ruling system for centuries), What if the Soviet Union had landed a human on the Moon before the United States? (the Soviet space program / continue with even more intensity).

(Unit 5A) Third conditional

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