Read the sentence.Mrs. Nguyen explained to the class that they did __________ on their achievement exams.Which word belongs in the blank?

The blank describes how the class did, so it needs an adverb modifying the verb “did.” “Well” is the adverb that means successfully; “good” is usually an adjective. The sentence should read, “Mrs. Nguyen explained to the class that they did well on their achievement exams.”

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