Meaning: 'Quality' refers to the standard or level of something, in this case, indicating how good or satisfactory life is in the Scandinavian countries.

Wrong options:

• density: Density refers to the amount of something in a given space, which does not relate to life standards.
• magnitude: Magnitude implies size or extent, which is not suitable for describing life conditions.
• frequency: Frequency relates to how often something occurs, which does not apply to the context of life standards.

Correct answer: front

Explanation: The term 'front' is used here to indicate a united position or stance, which fits contextually as it describes how these countries present themselves globally. It also aligns with the idea of a collective identity.

Meaning: 'Front' in this context means a united appearance or stance, particularly in international matters.

Wrong options:

• edge: Edge implies a physical boundary or advantage, which does not fit the context of a united stance.
• border: Border refers to a physical line separating areas, not applicable to the concept of a united front.
• atmosphere: Atmosphere relates to the mood or environment, which does not convey the idea of a united position.

Correct answer: mutually

Explanation: The word 'mutually' indicates that the intelligibility of the languages is shared between the countries, fitting grammatically and contextually as it describes a reciprocal relationship.

Meaning: 'Mutually' means that both parties are involved or benefit from something, in this case, understanding each other's languages.

Wrong options:

• similarly: Similarly suggests a comparison but does not convey the reciprocal nature of understanding languages.
• accurately: Accurately implies correctness but does not address the shared intelligibility aspect.
• dependently: Dependently suggests reliance, which does not fit the context of language understanding.

Correct answer: blend

Explanation: The term 'blend' effectively describes the combination of rivalry and brotherhood, fitting both grammatically and contextually as it conveys the idea of mixing two contrasting elements.

Meaning: 'Blend' refers to a mixture of different elements, indicating how rivalry and brotherhood coexist in these countries.

Wrong options:

• stair: Stair refers to a structure for ascending or descending, which does not relate to the concept of combining elements.
• turnover: Turnover typically relates to business or change, not applicable to the context of rivalry and brotherhood.
• comparison: Comparison implies evaluating similarities or differences, which does not convey the idea of a mixture.

Correct answer: maintaining

Explanation: The word 'maintaining' fits grammatically as it is a gerund that describes the ongoing action of keeping their welfare models intact, aligning well with the context of challenges faced by these countries.

Meaning: 'Maintaining' means to keep something in its existing state, in this case, the welfare models of the Scandinavian countries.

Wrong options:

• pertaining: Pertaining means relating to something, which does not fit the context of actively keeping welfare models.
• repainting: Repainting refers to applying new paint, which is irrelevant to the context of welfare models.
• remaining: Remaining implies staying in a place or condition, which does not convey the action of keeping welfare models.