Final answer:
The appropriate word to complete sentence 28 is 'Astonishing', which serves as an adjective in the context of the sentence. The correct option is b. Astonished.
Step-by-step explanation:
The correct word that fills in the blank in sentence 28 is b. Astonishing. This is the correct form to use because the sentence requires an adjective to modify the pronoun 'it' that precedes the blank. The complete sentence would be: 'Astonishing, all I could do was laugh.'
"Astonished, all I could do was laugh." In this context, "astonished" is the correct word as it conveys the narrator's state of being surprised or amazed upon discovering the keys in the guitar case. The word choice captures the emotion of the moment and fits grammatically in the sentence.
The sentence expresses the narrator's reaction to the unexpected discovery, emphasizing the contrast between the initial belief that the keys were lost and the surprising realization that they were in the guitar case all along.
The correct option is b. Astonished.