GRE Text Completion Question 1722

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Source: CQ

Many important inventions are the result of (i)_____; for example, Chinese alchemists accidentally discovered gunpowder while trying to create (ii)_____ that would make their emperor immortal.

Blank(i)Blank(ii)
A perseverance D a bane
B expedience E an elixir
C serendipity F a toxin

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