A or An
11. An ostrich
12. An alcohol
13. A television
14. An old man
15. An apple
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Learn More: How do we use "a" or "an" correctly?
We use "a" if the first letter of the noun is consonant (for example: television, book, cat, dog). Meanwhile, we use "an" if the first letter of the noun is vowel (a, e, i, o, u. for example: ostrich, alcohol, old, apple)
Take note: There are also some words that starts with consonant but the first letter can be silent. For example, hour. Since the h is silent, we use "an". An hour.
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