The correct adverb to fill in the blank in the sentence "Ruksana dances very _________" is: skillfully.

• Skillfully: This adverb describes the way Ruksana dances with a high level of skill or proficiency.
• Soundly: This adverb is typically used with verbs related to sleep or other activities, not with "dances." It doesn't fit the context.
• Abruptly: This adverb implies a sudden and unexpected manner, which may not be appropriate for describing dance unless specified in the context.
• Heavily: This adverb suggests a strong or forceful manner, which is not commonly used to describe dancing.