The appropriate adverb to fill in the blank is: carefully
The sentence would read: "Sandra drove carefully over the narrow causeway."
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Context: The sentence describes Sandra's action of driving over a narrow causeway.
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Appropriate Adverb: When driving over a narrow causeway, one would likely exercise caution and care to navigate the road safely.
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Option Analysis:
- Hanglitily: This is not a recognized adverb, and it doesn't convey the idea of careful driving.
- Carefully (Correct): This adverb accurately represents the manner in which Sandra is driving over the narrow causeway.
- Indignantly: This adverb expresses a feeling of anger or annoyance, which is not suitable in the context of driving over a causeway.
- Profusely: This adverb relates to something done in large quantities, typically involving a flow of liquids. It doesn't fit the context of driving.