Meaning: 'Prove' means to demonstrate the truth or existence of something through evidence or argument.

Wrong options:

• stay: The verb 'stay' implies remaining in a place, which does not convey the action of establishing evidence and is contextually irrelevant here.
• bring: The verb 'bring' suggests carrying something to a place, which does not fit the context of establishing proof regarding fingerprints.
• clear: The verb 'clear' typically means to remove or eliminate, which does not align with the context of confirming a suspect's presence.

Correct answer: identify

Explanation: The verb 'identify' is appropriate as it indicates the action of recognizing or establishing the identity of someone, which is the intended meaning in the context of using DNA to solve a case. It fits grammatically and contextually with the sentence structure.

Meaning: 'Identify' means to recognize or establish who someone is based on evidence or characteristics.

Wrong options:

• engage: The verb 'engage' means to participate or become involved, which does not fit the context of determining an individual's identity.
• stay: The verb 'stay' implies remaining in a place, which does not relate to the action of recognizing someone.
• listen: The verb 'listen' refers to the act of hearing, which is irrelevant in the context of identifying an individual.

Correct answer: reserve

Explanation: The verb 'reserve' fits grammatically as it indicates the action of keeping something for future use, which is relevant in the context of preserving DNA for matching purposes. It aligns with the sentence's intent and structure.

Meaning: 'Reserve' means to keep something for a particular purpose or future use, in this case, DNA for analysis.

Wrong options:

• change: The verb 'change' implies making something different, which does not fit the context of preserving DNA.
• increase: The verb 'increase' means to make something larger or greater, which is not relevant to the action of preserving DNA.
• introduce: The verb 'introduce' means to bring something into use for the first time, which does not align with the context of preserving existing DNA.

Correct answer: samples

Explanation: The noun 'samples' is appropriate as it refers to small quantities taken for analysis, which fits the context of matching DNA from crime scenes. It is grammatically correct and contextually relevant to the discussion of forensic evidence.

Meaning: 'Samples' refers to portions or examples taken for examination or analysis, particularly in scientific contexts.

Wrong options:

• ideas: The noun 'ideas' refers to thoughts or concepts, which does not fit the context of physical evidence like DNA.
• breaks: The noun 'breaks' typically refers to interruptions or fractures, which is irrelevant in the context of DNA matching.
• matches: The noun 'matches' implies a comparison or agreement, which does not fit as well as 'samples' in the context of DNA evidence.