Meaning: 'Or' is a conjunction used to indicate a choice or alternative between two options.

Wrong options:

• and: 'And' suggests addition rather than contrast, which does not fit the context of presenting opposing views.
• but: 'But' introduces a contradiction, which is not suitable here as both views are part of the debate rather than opposing statements.
• even: 'Even' is used to emphasize a surprising or unexpected element, which does not apply in this context.

Correct answer: caught

Explanation: The word 'caught' is the past participle form of the verb 'catch,' fitting grammatically as it follows 'if' in a conditional clause. It indicates that if graffiti creators are apprehended, they can be arrested, aligning with the legal context provided.

Meaning: 'Caught' means to be captured or apprehended, particularly in the context of being discovered while committing an act.

Wrong options:

• to catch: 'To catch' is an infinitive form and does not fit grammatically in the conditional structure of the sentence.
• catching: 'Catching' is a gerund form and does not work in this context as it does not fit the conditional clause structure.
• catches: 'Catches' is the present tense form, which is not appropriate here as the sentence requires a past participle.

Correct answer: must

Explanation: The word 'must' indicates a strong obligation or necessity, fitting grammatically and contextually as it conveys that officials are required to make complex decisions regarding graffiti retention.

Meaning: 'Must' expresses necessity or obligation, indicating that officials have a duty to make these decisions.

Wrong options:

• might: 'Might' suggests possibility rather than necessity, which does not convey the required sense of obligation in this context.
• should: 'Should' implies a recommendation rather than a requirement, which is weaker than the obligation expressed by 'must.'
• ought: 'Ought' is similar to 'should' and does not convey the same level of necessity as 'must'.

Correct answer: tourism

Explanation: The word 'tourism' fits grammatically as a noun that refers to the activity of visiting places for pleasure. It aligns contextually with the idea of attracting visitors to the area due to admired graffiti.

Meaning: 'Tourism' refers to the business of providing services for people traveling for pleasure, indicating that the graffiti attracts visitors.

Wrong options:

• sightseeing: 'Sightseeing' refers to the activity of visiting places of interest, but it does not fit as a noun that describes the overall concept of attracting visitors.
• exploration: 'Exploration' implies a search or investigation, which does not fit the context of attracting visitors to admire graffiti.
• visitation: 'Visitation' refers to the act of visiting, but it is less commonly used in this context compared to 'tourism,' which encompasses the broader concept.

Correct answer: them

Explanation: The word 'them' is a pronoun that correctly refers to the local residents, maintaining pronoun-antecedent agreement in number and gender. It fits contextually as it indicates the residents' belief about ownership of the graffiti.

Meaning: 'Them' is a pronoun used to refer to a group of people previously mentioned, in this case, the local residents.

Wrong options:

• us: 'Us' implies inclusion of the speaker, which does not fit as the residents are expressing a belief about ownership separate from the auction context.
• him or her: 'Him or her' is singular and does not match the plural antecedent of 'local residents,' making it grammatically incorrect.
• they: 'They' is a pronoun that could refer to the residents, but it does not fit the possessive context of ownership as effectively as 'them.'