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