A.I. Explanation:

Correct answer: estimate

Explanation: The word 'estimate' is a verb that fits grammatically as it follows 'to' in the infinitive form. Contextually, it aligns with the idea of determining an approximate number, which is the main topic of the sentence.

Meaning: 'Estimate' means to roughly calculate or judge the value, number, quantity, or extent of something.

Wrong options:

• unfold: The verb 'unfold' means to open or spread out something that was folded, which does not relate to calculating numbers.
• figure: The verb 'figure' can mean to calculate, but it does not fit the infinitive structure 'to figure' in this context as well as 'to estimate' does.
• surveys: The noun 'surveys' does not fit here as it does not serve as a verb in the infinitive form and does not relate to the action of estimating.
• funds: The noun 'funds' refers to money available for spending, which does not fit the context of estimating numbers.

Correct answer: surveys

Explanation: The word 'surveys' is a plural noun that fits grammatically as it follows the verb 'regularly,' indicating the action the government takes. Contextually, it aligns with the idea of collecting data from households.

Meaning: 'Surveys' refer to systematic investigations or questionnaires designed to gather information.

Wrong options:

• unfold: The verb 'unfold' does not fit in this context as it does not relate to the action of collecting data from households.
• sell: The verb 'sell' does not fit here as it does not relate to the government's action of gathering information.
• figure: The noun 'figure' does not fit as it does not relate to the action of conducting surveys and is not in the correct form.
• funds: The noun 'funds' does not fit as it refers to money and does not relate to the action of surveying.

Correct answer: sell

Explanation: The word 'sell' is a verb that fits grammatically as it follows 'quickly,' maintaining the parallel structure with 'buy.' Contextually, it aligns with the action of disposing of old devices after purchasing new ones.

Meaning: 'Sell' means to exchange something for money, which fits the context of people getting rid of their old devices.

Wrong options:

• unfold: The verb 'unfold' does not fit here as it does not relate to the action of selling devices.
• figure: The verb 'figure' does not fit in this context as it does not relate to the action of selling and does not maintain the parallel structure.
• surveys: The noun 'surveys' does not fit as it does not relate to the action of selling and is not in the correct form.
• funds: The noun 'funds' does not fit as it refers to money and does not relate to the action of selling.