Meaning: 'Concept' refers to an idea or a mental representation of something.

Wrong options:

• process: 'Process' is a noun that refers to a series of actions or steps taken to achieve a particular end, which does not fit the context of changing an idea.
• borders: 'Borders' is a noun that refers to the edges or boundaries of something, which is unrelated to the notion of changing an idea about retirement.
• simultaneously: 'Simultaneously' is an adverb that means occurring at the same time, which does not fit as a noun in this context.
• rapidly: 'Rapidly' is an adverb that means quickly, which does not fit as a noun to describe a change in understanding.
• delay: 'Delay' is a noun that refers to a period of time by which something is late, which does not fit the context of changing a concept.
• gradually: 'Gradually' is an adverb that means slowly over a period of time, which does not fit as a noun in this context.
• slowly: 'Slowly' is an adverb that describes the manner of an action, which does not fit as a noun.

Correct answer: delay

Explanation: The word 'delay' serves as a verb in this context, indicating the action of postponing retirement. It fits grammatically and contextually as it aligns with the government's encouragement for mature workers to extend their working years.

Meaning: 'Delay' means to postpone or to make something happen later than planned.

Wrong options:

• process: 'Process' does not fit as it refers to a series of actions rather than an action of postponing.
• borders: 'Borders' is unrelated to the action of delaying and does not fit grammatically.
• simultaneously: 'Simultaneously' is an adverb that does not convey the action of postponing and does not fit in this context.
• rapidly: 'Rapidly' is an adverb that describes speed, which does not relate to the action of delaying retirement.
• concept: 'Concept' is a noun that does not fit as a verb in this context.
• gradually: 'Gradually' is an adverb that describes the manner of an action, which does not fit as a verb here.
• slowly: 'Slowly' is an adverb that does not convey the action of delaying.

Correct answer: gradually

Explanation: The word 'gradually' is an adverb that describes the manner in which mature age workers reduce their hours. It fits grammatically and contextually, indicating a slow and steady process of change.

Meaning: 'Gradually' means occurring in small stages over a period of time.

Wrong options:

• process: 'Process' is a noun and does not fit as an adverb to describe how hours are reduced.
• borders: 'Borders' is unrelated to the action of reducing hours and does not fit grammatically.
• simultaneously: 'Simultaneously' is an adverb that means at the same time, which does not fit the context of a gradual reduction.
• delay: 'Delay' is a verb and does not fit as an adverb in this context.
• concept: 'Concept' is a noun that does not fit as an adverb to describe the manner of reducing hours.
• rapidly: 'Rapidly' is an adverb that means quickly, which contradicts the idea of a gradual reduction.
• slowly: 'Slowly' is an adverb that could fit but does not convey the same nuance of gradual change as 'gradually'.

Correct answer: barriers

Explanation: The word 'barriers' is a noun that refers to obstacles or hindrances. It fits grammatically and contextually as it describes the obstacles that employers aim to remove between different segments of people's lives.

Meaning: 'Barriers' refers to obstacles that prevent progress or movement.

Wrong options:

• process: 'Process' does not fit as it refers to a series of actions rather than obstacles.
• borders: 'Borders' refers to edges or boundaries, which does not convey the idea of obstacles in this context.
• simultaneously: 'Simultaneously' is an adverb that does not fit as a noun to describe obstacles.
• rapidly: 'Rapidly' is an adverb that describes speed, which does not relate to the concept of barriers.
• concept: 'Concept' is a noun that does not fit in the context of describing obstacles.
• delay: 'Delay' is a noun that refers to a period of time by which something is late, which does not fit as a description of obstacles.
• gradually: 'Gradually' is an adverb that does not fit as a noun in this context.

Correct answer: simultaneously

Explanation: The word 'simultaneously' is an adverb that indicates that the needs of employers and employees can be met at the same time. It fits grammatically and contextually, emphasizing the concurrent nature of meeting these needs.

Meaning: 'Simultaneously' means occurring at the same time.

Wrong options:

• process: 'Process' is a noun that does not fit as an adverb to describe the timing of meeting needs.
• borders: 'Borders' is unrelated to the timing of meeting needs and does not fit grammatically.
• delay: 'Delay' is a noun that refers to a postponement, which contradicts the idea of simultaneous action.
• concept: 'Concept' is a noun that does not fit as an adverb in this context.
• rapidly: 'Rapidly' is an adverb that describes speed, which does not convey the idea of simultaneous action.
• gradually: 'Gradually' is an adverb that describes a slow process, which does not fit the context of simultaneous action.
• slowly: 'Slowly' is an adverb that describes the manner of an action, which does not fit the context of meeting needs at the same time.