If the Roman Empire had never ____, Latin would ____ remained the universal language. If aliens ____ on Earth, somebody would ____ some physical evidence to prove it by now. Perhaps dinosaurs ____ survived if an asteroid ____ hit the Earth. Perhaps Sir Isaac Newton wouldn't have ____ about gravity if an apple ____ on his head. The world would ____ evolved in a totally different way if somebody ____ invented the computer two hundred years ago. If the Titanic ____ hit an iceberg, it ____ arrived in New York safely.

Gateway B1+ unit 9 3 conditional

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