Meaning: 'Complexes' refers to groups of interconnected things, in this case, social media networks that serve as platforms for sharing information.

Wrong options:

• networks: 'Networks' could fit but is less specific than 'complexes' in this context, which emphasizes the intricate nature of social media.
• frames: 'Frames' typically refer to structures or borders and do not convey the idea of interconnected systems relevant to social media.
• structures: 'Structures' implies a physical arrangement rather than the dynamic and interactive nature of social media platforms.

Correct answer: bases

Explanation: The word 'bases' is appropriate here as it indicates foundational sources of information, which aligns with the context of journalists relying on social media for images.

Meaning: 'Bases' refers to the underlying sources or foundations upon which something is built, in this case, the images used by journalists.

Wrong options:

• sources: 'Sources' could work but is more general; 'bases' emphasizes the foundational aspect of these images in journalism.
• roots: 'Roots' suggests origins rather than the functional role of social media in providing images for news.
• springs: 'Springs' implies a source of water or energy, which does not fit the context of information gathering in journalism.

Correct answer: posted

Explanation: The word 'posted' is the correct choice as it refers to the act of sharing content on social media, fitting grammatically and contextually within the sentence discussing user-generated content.

Meaning: 'Posted' means to share or publish content online, particularly on social media platforms.

Wrong options:

• deposited: 'Deposited' implies placing something down, which does not convey the active sharing aspect of social media.
• planted: 'Planted' suggests a deliberate placement, often with negative connotations, which does not fit the context of sharing images.
• imposed: 'Imposed' indicates forcing something upon others, which is not relevant to the voluntary act of sharing content on social media.

Correct answer: indicating

Explanation: The word 'indicating' is suitable as it suggests that research is showing or pointing out a trend, which aligns with the context of the sentence discussing findings about people's behavior.

Meaning: 'Indicating' means to show or point out something, in this case, the tendency of people to film or photograph news events.

Wrong options:

• displaying: 'Displaying' implies showing something visually, which does not capture the essence of research findings as effectively as 'indicating.'
• presenting: 'Presenting' suggests formally showing information, which is not as direct as 'indicating' in this context.
• expressing: 'Expressing' refers to conveying thoughts or feelings, which does not fit the context of research findings.

Correct answer: play

Explanation: The verb 'play' is appropriate here as it indicates a role or function, fitting grammatically and contextually with the sentence discussing the future of media.

Meaning: 'Play' means to have a role or function in something, in this case, the involvement of user-generated content in media.

Wrong options:

• serve: 'Serve' implies providing a service, which is less dynamic than 'play' in indicating an active role.
• apply: 'Apply' suggests putting something into practice, which does not fit the context of discussing roles in media.
• face: 'Face' does not fit grammatically or contextually, as it implies confronting something rather than having a role.

Correct answer: taken

Explanation: The word 'taken' is the correct choice as it indicates actions that need to be undertaken, fitting well within the context of ensuring ethical practices in media.

Meaning: 'Taken' means to carry out or execute actions, in this case, steps that must be implemented to maintain ethical standards.

Wrong options:

• climbed: 'Climbed' refers to ascending, which does not relate to the context of taking actions or steps.
• made: 'Made' is too vague and does not convey the specific action of implementing steps as effectively as 'taken.'
• walked: 'Walked' implies moving on foot, which does not fit the context of taking necessary actions in media ethics.