Meaning: In this context, 'cases' means specific instances or examples where something occurs, indicating that there are situations in musicals where dance is featured.

Wrong options:

• dimensions: 'Dimensions' refers to measurable extents or aspects, which does not fit the context of discussing instances of dance in musicals.
• brief: 'Brief' is an adjective meaning short in duration, which does not logically connect to the idea of instances or situations.
• extent: 'Extent' refers to the degree or scope of something, which does not appropriately convey the idea of specific instances.

Correct answer: plot

Explanation: The word 'plot' is a noun that refers to the main story or narrative of a musical. It fits grammatically and contextually, as the sentence discusses how dance should be an integral part of the storyline rather than just an addition.

Meaning: 'Plot' means the main events or storyline of a play or musical, indicating that dance should contribute meaningfully to the overall narrative.

Wrong options:

• prowess: 'Prowess' refers to skill or expertise, which does not relate to the narrative structure of a musical.
• phenomenon: 'Phenomenon' refers to an observable event or occurrence, which does not fit the context of discussing the storyline.
• round about: 'Round about' is a phrase that does not function as a noun and does not convey a relevant meaning in this context.

Correct answer: enhances

Explanation: The word 'enhances' is a verb that means to improve or augment something. It fits grammatically and contextually, as it indicates that dance adds value to the drama rather than detracting from it.

Meaning: 'Enhances' means to make something better or more effective, suggesting that dance improves the overall quality of the drama.

Wrong options:

• encumbers: 'Encumbers' means to hinder or burden, which is the opposite of what is intended in this context, as it suggests that dance would negatively affect the drama.
• levels: 'Levels' is a verb that means to make something flat or equal, which does not convey the intended meaning of improving the drama.
• crumples: 'Crumples' means to collapse or fold, which does not fit the context of adding value to the drama.