Meaning: 'Least' refers to the smallest amount or degree, indicating that he could have at the very minimum offered some help.

Wrong options:

• once: The word 'once' implies a single occurrence and does not convey the idea of minimum expectation, making it contextually irrelevant here.
• most: 'Most' suggests the highest degree, which contradicts the intended meaning of minimal help that could have been given.
• best: 'Best' indicates the highest quality or degree, which does not fit the context of expressing a lack of sufficient help.

Correct answer: paying

Explanation: The word 'paying' is the correct choice as it fits the context of someone being attentive or focused. The phrase 'paying attention' is a common collocation, making it grammatically and contextually appropriate.

Meaning: 'Paying' in this context refers to the act of focusing or being attentive to something, indicating that the driver was not concentrating on the road.

Wrong options:

• giving: 'Giving attention' is not a standard phrase in English, making it sound awkward and incorrect in this context.
• attracting: 'Attracting attention' implies drawing focus towards oneself, which does not fit the context of the driver failing to notice Sarah.
• providing: 'Providing attention' is not a commonly used expression and does not convey the intended meaning of being attentive.

Correct answer: unfortunate

Explanation: The word 'unfortunate' fits well as it describes a regrettable situation, aligning with the sentiment of disappointment expressed in the sentence. It is grammatically correct and contextually relevant.

Meaning: 'Unfortunate' means something that is regrettable or unlucky, indicating that it is a pity that nobody recorded the driver's number.

Wrong options:

• unfavourable: 'Unfavourable' suggests a negative condition but does not capture the emotional aspect of regret present in the context.
• inopportune: 'Inopportune' refers to something occurring at an inconvenient time, which does not fully express the sentiment of regret about the situation.
• undesirable: 'Undesirable' implies something that is not wanted, which does not convey the emotional weight of the situation as effectively as 'unfortunate'.

Correct answer: shaken

Explanation: The word 'shaken' is appropriate as it describes a state of emotional disturbance or shock, fitting the context of Sarah's experience after the incident. It is grammatically correct and contextually relevant.

Meaning: 'Shaken' means to be emotionally disturbed or unsettled, indicating that Sarah is still recovering from the traumatic experience.

Wrong options:

• discouraged: 'Discouraged' implies a loss of confidence or enthusiasm, which does not accurately reflect the emotional state described in the context.
• overcome: 'Overcome' suggests being overwhelmed by emotions, but it lacks the specific connotation of shock that 'shaken' provides.
• confused: 'Confused' indicates a lack of clarity or understanding, which does not capture the emotional impact of the incident as effectively as 'shaken'.

Correct answer: work

Explanation: The word 'work' is the most suitable choice as it refers to a general place of employment, fitting the context of returning to her job. It is grammatically correct and aligns with the tone of the sentence.

Meaning: 'Work' refers to a place where one is employed or the tasks one performs for a job, indicating Sarah's return to her professional responsibilities.

Wrong options:

• post: 'Post' typically refers to a specific position or role, which does not fit the general context of returning to a workplace.
• job: 'Job' is more specific and does not convey the broader sense of returning to a workplace as effectively as 'work'.
• employment: 'Employment' refers to the state of having a job, but it is less commonly used to describe the physical location of work compared to 'work'.