1) If the Titanic ... the iceberg earlier, it wouldn’t have sunk. a) had seen b) would see c) saw 2) If people ... vaccines sooner, many lives would have been saved. a) had invented b) have invented c) invented 3) If the Wright brothers had not built their airplane, flying ... more slowly. a) will have developed b) would developed c) would have developed 4) If ancient Egyptians had not built the pyramids, we .... such amazing monuments today. a) won’t have had b) wouldn’t have had c) wouldn’t had 5) If Columbus .... west, Europeans wouldn’t have discovered America in 1492. a) had not sailed b) did not sail c) has not sailed 6) If Gutenberg .... the printing press, books would have remained very expensive. a) wouldn’t invented b) didn’t invent c) hadn’t invented 7) If the Great Fire of London had not happened, the city ... rebuilt the way it was. a) wouldn’t have been b) wouldn’t been c) won’t have been 8) If scientists ... electricity, modern technology wouldn’t have developed so fast. a) didn’t discover b) hadn’t discovered c) wouldn’t discovered 9) If Marie Curie hadn’t researched radiation, medicine ... in the same way. a) wouldn’t have advanced b) didn’t have advanced c) wouldn’t advanced 10) If the first astronauts ... on the Moon, space exploration would have grown more slowly. a) did not land b) had not land c) had not landed 11) If ancient Greeks ... mathematics, many modern ideas wouldn’t have existed. a) didn’t study b) hadn’t studied c) wouldn’t studied 12) If the telephone ..., communication would have remained much slower. a) had not been invented b) had not invented c) would not been invented

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