Meaning: Foundations are the lowest load-bearing part of a building, typically below ground level.

Wrong options:

• construct: 'Construct' is a verb meaning to build something, which does not fit as it does not refer to the base of the Tower.
• delay: 'Delay' is a noun that refers to a period of time by which something is late, which does not relate to the structural aspect of the Tower.
• distance: 'Distance' is a noun that refers to the amount of space between two points, which is irrelevant in this context.
• features: 'Features' is a noun that refers to distinctive attributes or aspects, which does not pertain to the foundational aspect of the Tower.

Correct answer: delay

Explanation: The term 'delay' fits as it indicates a period of time during which construction was paused. This is contextually relevant as it suggests that the pause allowed the ground to stabilize, which is crucial to the overall understanding of the Tower's construction.

Meaning: Delay refers to a period of time when something is postponed or slowed down.

Wrong options:

• construct: 'Construct' is a verb that does not fit as it does not indicate a period of time or pause in construction.
• foundations: 'Foundations' is a noun that refers to the base of the building, which does not relate to the timing of construction.
• distance: 'Distance' is a noun that refers to space between two points, which does not apply to the timing of construction.
• features: 'Features' is a noun that refers to characteristics, which does not relate to the timing of construction.

Correct answer: storeys

Explanation: The word 'storeys' refers to the levels or floors of a building, which is contextually appropriate as it discusses the addition of levels to the Tower after the initial construction phase. It fits grammatically as a plural noun that aligns with the subject of the sentence.

Meaning: Storeys are the levels or floors in a building.

Wrong options:

• construct: 'Construct' is a verb that does not fit as it does not refer to the levels of a building.
• delay: 'Delay' is a noun that refers to a period of time, which does not pertain to the physical structure of the Tower.
• distance: 'Distance' is a noun that refers to space between two points, which is irrelevant in this context.
• features: 'Features' is a noun that refers to distinctive attributes, which does not relate to the levels of the Tower.

Correct answer: counteract

Explanation: The term 'counteract' is a verb that means to act against something in order to reduce its force or neutralize it. In this context, it describes the builders' efforts to mitigate the lean of the Tower, making it grammatically and contextually appropriate.

Meaning: Counteract means to act against something to reduce its effect.

Wrong options:

• construct: 'Construct' is a verb that means to build, which does not fit as it does not relate to the action of mitigating the lean.
• delay: 'Delay' is a noun that refers to a period of time, which does not apply to the action taken by the builders.
• distance: 'Distance' is a noun that refers to space between two points, which is irrelevant in this context.
• features: 'Features' is a noun that refers to characteristics, which does not relate to the action of addressing the lean.