Complete the following sentence with the correct option:
My grandfather walks very _____ .

Question

Accepted Answer

The sentence to be completed is: "My grandfather walks very _____."

1. **Explanation for Option 3 ("fast")**:
   - The word "fast" is an adverb that describes the manner in which an action is performed. In this context, it is used to describe how the grandfather walks. "Fast" is the correct adverbial form to use when describing the speed of an action. Therefore, "My grandfather walks very fast" is grammatically correct and conveys the intended meaning that the grandfather walks at a high speed.

2. **Explanation for why other options are incorrect**:
   - **Option 1 ("quick")**: "Quick" is an adjective, not an adverb. It is used to describe nouns, not verbs. Since the sentence requires an adverb to describe the verb "walks," "quick" is not appropriate in this context.
   - **Option 2 ("fastly")**: "Fastly" is not a standard English word. The correct adverb form is "fast," which is already provided in Option 3. Therefore, "fastly" is incorrect and not used in standard English.
   - **Option 4 ("nice")**: "Nice" is an adjective and is used to describe nouns, not verbs. Since the sentence requires an adverb to describe the verb "walks," "nice" does not fit grammatically in this context.

In conclusion, Option 3 ("fast") is the correct choice because it is the appropriate adverb to describe the manner in which the grandfather walks.