A.I. Explanation:

Correct answer: surveying

Explanation: The word 'surveying' is a gerund that functions as a noun in this context, indicating the action of collecting data. It fits grammatically as it describes the method used by the British government to gather information about household expenditure.

Meaning: 'Surveying' refers to the process of collecting data or information, typically through questionnaires or interviews.

Wrong options:

• valuable: 'Valuable' is an adjective that describes worth or importance, which does not fit as it does not indicate an action.
• buying: 'Buying' is a gerund that implies the act of purchasing, which does not relate to the method of data collection.
• general: 'General' is an adjective that describes something broad or not specific, which does not fit the context of data collection.
• average: 'Average' is a noun or adjective that refers to a typical amount, which does not indicate the action of collecting data.
• halved: 'Halved' is a verb that indicates a reduction by half, which does not fit as it does not describe the method of data collection.
• decline: 'Decline' is a noun or verb that indicates a decrease, which does not fit as it does not describe the action of collecting data.

Correct answer: valuable

Explanation: The term 'valuable' is an adjective that describes the insight gained from the reports. It fits grammatically as it modifies the noun 'insight,' indicating that the information is important and useful.

Meaning: 'Valuable' means having worth or significance, particularly in terms of providing useful information.

Wrong options:

• surveying: 'Surveying' is a gerund that refers to the action of collecting data, which does not fit as it does not describe the quality of insight.
• buying: 'Buying' is a gerund that implies the act of purchasing, which does not relate to the quality of insight.
• general: 'General' is an adjective that describes something broad or not specific, which does not accurately describe the insight gained from the reports.
• average: 'Average' is a noun or adjective that refers to a typical amount, which does not describe the quality of insight.
• halved: 'Halved' is a verb that indicates a reduction by half, which does not fit as it does not describe the quality of insight.
• decline: 'Decline' is a noun or verb that indicates a decrease, which does not fit as it does not describe the quality of insight.

Correct answer: average

Explanation: The word 'average' serves as a noun in this context, referring to a typical or mean value. It fits grammatically as it indicates the general condition or situation regarding the percentage of income spent on accommodation.

Meaning: 'Average' refers to the typical amount or level of something, in this case, the percentage of income spent.

Wrong options:

• surveying: 'Surveying' is a gerund that refers to the action of collecting data, which does not fit as it does not describe a typical amount.
• valuable: 'Valuable' is an adjective that describes worth or importance, which does not fit as it does not indicate a typical amount.
• buying: 'Buying' is a gerund that implies the act of purchasing, which does not relate to the concept of a typical amount.
• halved: 'Halved' is a verb that indicates a reduction by half, which does not fit as it does not describe a typical amount.
• decline: 'Decline' is a noun or verb that indicates a decrease, which does not fit as it does not describe a typical amount.
• general: 'General' is an adjective that describes something broad or not specific, which does not accurately describe a typical amount.

Correct answer: halved

Explanation: The term 'halved' is a verb that indicates a reduction by half. It fits grammatically as it describes the change in the percentage used for food and clothing, providing a clear comparison to the previous statement about accommodation spending.

Meaning: 'Halved' means to reduce something to half its original amount.

Wrong options:

• surveying: 'Surveying' is a gerund that refers to the action of collecting data, which does not fit as it does not describe a change in percentage.
• valuable: 'Valuable' is an adjective that describes worth or importance, which does not fit as it does not indicate a change in percentage.
• buying: 'Buying' is a gerund that implies the act of purchasing, which does not relate to the change in percentage.
• average: 'Average' is a noun or adjective that refers to a typical amount, which does not describe a reduction in percentage.
• decline: 'Decline' is a noun or verb that indicates a decrease, but it does not specify the extent of the decrease as 'halved' does.
• general: 'General' is an adjective that describes something broad or not specific, which does not fit as it does not indicate a change in percentage.

Correct answer: decline

Explanation: The word 'decline' serves as a noun that indicates a decrease in the purchase of tobacco. It fits grammatically as it describes the significant reduction in spending, aligning with the context of the data presented.

Meaning: 'Decline' refers to a decrease or reduction in quantity or quality.

Wrong options:

• surveying: 'Surveying' is a gerund that refers to the action of collecting data, which does not fit as it does not describe a decrease in spending.
• valuable: 'Valuable' is an adjective that describes worth or importance, which does not fit as it does not indicate a decrease.
• buying: 'Buying' is a gerund that implies the act of purchasing, which does not relate to the concept of a decrease in spending.
• average: 'Average' is a noun or adjective that refers to a typical amount, which does not describe a decrease in spending.
• halved: 'Halved' is a verb that indicates a reduction by half, but it does not capture the broader concept of decline as a noun does.
• general: 'General' is an adjective that describes something broad or not specific, which does not fit as it does not indicate a decrease.