A.I. Explanation:

Correct answer: least

Explanation: The word 'least' fits grammatically as it indicates the minimum expectation of help that could have been provided, aligning with the context of expressing disappointment. It suggests that even the smallest effort would have been better than nothing, which is appropriate in this context.

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'.