Fill in the blank with the correct article in the following sentence.

She saw _____ one-eyed monster in her nightmare.

a

The correct answer is Option (1) → a

• The word "one-eyed" begins with the vowel letter "o", but it is pronounced with a consonant sound ("wun-eyed").
• Since the article "an" is used before words that start with a vowel sound and "a" is used before words that start with a consonant sound, the correct choice is:  "a one-eyed monster"

 "She saw a one-eyed monster in her nightmare."

Why not "the": You can use “the”, but only when the noun is specific and already known or identified. In this sentence, “She saw ___ one-eyed monster in her nightmare,” the monster is being mentioned for the first time and is not something previously known to the listener or reader, so it remains indefinite, and we use “a.” If the sentence was referring to a particular monster that had already been mentioned or was clearly specified (for example, “She saw the one-eyed monster from the movie again in her nightmare”), then “the” would be correct. Here, since it is just any one-eyed monster, “a” is the appropriate choice.