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  • I saw ___ (a / an) unicorn in the illustration for the storybook.
    a
  • He was appointed ___ head of the marketing department after only two years in the company.
    a
  • The company launched ___ (a / an) updated version of the software yesterday.
    an
  • They took ___ (a / an) active role in promoting environmental awareness.
    an
  • I had ___ opportunity to meet the author at the book signing event.
    an
  • She has ___ (a / an) hypothesis that could change how we think about the issue.
    a
  • She gave ___ interesting presentation on the effects of social media on mental health.
    an
  • The scientist proposed ___ innovative theory about black holes.
    an
  • We watched ___ old movie that has become ___ cult classic.
    an/a
  • They had ___ amazing adventure in the Amazon rainforest.
    an
  • She’ll be giving ___ long presentation on climate policy tomorrow.
    a
  • He’s become ___ expert on medieval history after years of study.
    an
  • After years of research, they finally made ___ breakthrough discovery.
    a
  • It’s ___ once-in-___ lifetime chance to visit Antarctica.
    an/a
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