Meaning: 'Inevitable' means certain to happen; unavoidable, indicating that digging is a fundamental aspect of archaeological work that cannot be escaped.

Wrong options:

• inflexible: 'Inflexible' means rigid or unable to change, which does not convey the unavoidable nature of digging in archaeology.
• inclusive: 'Inclusive' refers to including all parts or elements, which does not relate to the necessity of digging in this context.
• infalliable: 'Infalliable' means incapable of making mistakes or being wrong, which does not apply to the context of digging being a necessary part of archaeology.

Correct answer: scans

Explanation: The word 'scans' is appropriate as it refers to the process of examining something closely, which fits the context of medical imaging. It aligns grammatically and contextually with the idea of doctors using technology to see parts of the body.

Meaning: 'Scans' refers to the use of imaging technology to examine or inspect something, particularly in a medical context.

Wrong options:

• looks: 'Looks' is too vague and informal for this context, lacking the specificity of examining with technology.
• regards: 'Regards' implies consideration or attention but does not convey the action of examining or inspecting.
• sights: 'Sights' refers to the act of seeing but does not fit the technical context of medical imaging.

Correct answer: out

Explanation: The word 'out' fits grammatically and contextually as it indicates the action of making something visible or clear. It aligns with the idea of identifying archaeological features that are not easily seen from the ground.

Meaning: 'Out' in this context means to reveal or make known, particularly in relation to archaeological features.

Wrong options:

• through: 'Through' implies a means of doing something but does not convey the action of revealing or identifying features.
• for: 'For' indicates purpose but does not fit the context of making features visible.
• up: 'Up' does not convey the intended meaning of revealing or identifying features in this context.

Correct answer: error

Explanation: The word 'error' fits well as it refers to a mistake made during the process of trial and experimentation. It aligns grammatically and contextually with the idea of learning from mistakes in developing techniques.

Meaning: 'Error' means a mistake or inaccuracy, particularly in the context of trial and error in research.

Wrong options:

• failure: 'Failure' implies a lack of success but does not specifically refer to mistakes made during the process.
• mistake: 'Mistake' is similar to 'error' but is less formal and does not fit the tone of the sentence as well.
• fault: 'Fault' implies blame or responsibility, which does not align with the context of learning from trials.

Correct answer: subtle

Explanation: The word 'subtle' is appropriate as it describes changes that are not immediately obvious, fitting the context of detecting slight variations in the land's surface. It aligns grammatically and contextually with the idea of nuanced detection.

Meaning: 'Subtle' means delicate or not obvious, indicating that the changes detected are minor and require careful observation.

Wrong options:

• hard: 'Hard' implies difficulty or toughness, which does not relate to the nature of the changes being detected.
• mild: 'Mild' suggests a gentle or moderate quality but does not convey the nuanced nature of the changes.
• soft: 'Soft' refers to texture or gentleness, which does not fit the context of detecting changes in the land.