Meaning: 'Challenges' means to question or dispute something, indicating that Dr. Itti's article is questioning the current understanding of attention.

Wrong options:

• annoys: 'Annoys' implies causing irritation, which does not fit the academic context of the article's purpose.
• tests: 'Tests' suggests an experimental approach, but does not convey the idea of questioning understanding as effectively as 'challenges'.
• adds: 'Adds' implies simply contributing information, which lacks the critical nuance of questioning that 'challenges' provides.

Correct answer: Previous

Explanation: The word 'Previous' is an adjective that correctly modifies 'studies', indicating that these studies occurred before the current research, fitting grammatically and contextually.

Meaning: 'Previous' means something that occurred before, indicating that earlier studies did not consider certain individual factors.

Wrong options:

• First: 'First' implies a sequence, suggesting it is the initial study, which does not accurately reflect the context of prior research.
• Before: 'Before' is a preposition that does not grammatically fit as it cannot modify 'studies' directly in this context.
• One-time: 'One-time' suggests a singular occurrence, which does not accurately describe the ongoing nature of previous studies.

Correct answer: participants

Explanation: The word 'participants' is a noun that fits grammatically as it refers to individuals involved in the study, aligning with the context of research.

Meaning: 'Participants' refers to the people who take part in a study or experiment, indicating those who watched the videos.

Wrong options:

• beings: 'Beings' is too broad and vague, typically referring to living entities, which does not specifically denote individuals in a study.
• players: 'Players' suggests involvement in a game or sport, which is not relevant to the context of a research study.
• characters: 'Characters' implies fictional entities, which does not fit the context of real individuals participating in research.

Correct answer: drawing

Explanation: The word 'drawing' is a present participle that fits grammatically and contextually, indicating that the pedestrians and cars are actively attracting attention away from the conversation.

Meaning: 'Drawing' means to attract or pull attention, indicating that the movement of pedestrians and cars diverts focus from the interview.

Wrong options:

• interesting: 'Interesting' is an adjective that does not fit grammatically as it cannot describe the action of attracting attention.
• bringing: 'Bringing' implies carrying something to a place, which does not accurately convey the action of attracting attention in this context.
• paying: 'Paying' is a verb that does not fit here as it suggests giving attention rather than drawing it away.

Correct answer: tended

Explanation: The word 'tended' is the past tense of 'tend', fitting grammatically as it describes a habitual action in the past, aligning with the context of the study's findings.

Meaning: 'Tended' means to have a tendency or inclination towards something, indicating that women were more often distracted by other people.

Wrong options:

• accept: 'Accept' implies agreement or approval, which does not fit the context of distraction.
• preferred: 'Preferred' suggests a choice, which does not accurately describe the action of being distracted.
• elect: 'Elect' means to choose or decide, which is not relevant to the context of distraction in this study.