Choose the word or set of words that, when inserted in the sentence, best fits the meaning of the sentence as a whole.
The ------- of drug-resistant strains of bacteria and viruses has ------- researchers’ hopes that permanent victories against many diseases have been achieved.
- vigor . . corroborated
- feebleness . . dashed
- proliferation . . blighted
- destruction . . disputed
- disappearance . . frustrated
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