Fill in the blank with most appropriate option:
The professor spoke so ___ that many students lost interest.
Show answer & explanation
Correct answer: C
Explanation
Correct Answer
monotonously
Explanation
The sentence requires the correct part of speech to modify the action of speaking.
The blank directly modifies the verb "spoke", answering the question how the professor delivered the lecture. In English grammar, a word that modifies a verb must be an adverb. Most adverbs are formed by adding the suffix "-ly" to an adjective. Therefore, monotonously (meaning in a dull, unvarying, or repetitive tone) is the grammatically correct choice.
The other choices are incorrect because they represent different parts of speech:
Monotony is a noun, representing the state of being tedious or repetitive.
Monotonous is an adjective, which can only be used to modify a noun (e.g., a monotonous voice).
Monotonic is an adjective, typically used in mathematical or technical contexts to describe a sequence or function moving in a single direction.
Key Points
To determine the correct word form in fill-in-the-blank exam questions, identify what is being modified. If it is an action/verb, select the modifier ending in "-ly" (an adverb).