A.I. Explanation:

Correct answer: announced

Explanation: The word 'announced' is the past tense of the verb 'announce,' which fits grammatically as it describes an action that took place in the past (December 1978). It aligns with the context of discussing a policy that was formally declared by Deng Xiaoping.

Meaning: To 'announce' means to make a public declaration about something.

Wrong options:

• submitted: The word 'submitted' implies presenting something for consideration, which does not fit the context of declaring a policy.
• evenly: The adverb 'evenly' does not relate to the action of declaring or announcing a policy.
• belief: 'Belief' is a noun that does not fit grammatically as it does not describe an action.
• balance: 'Balance' is a noun or verb that does not relate to the action of announcing a policy.

Correct answer: belief

Explanation: The term 'belief' is a noun that indicates a conviction or acceptance that something is true. It fits contextually as it describes Deng Xiaoping's conviction regarding the necessity of foreign investment for modernization.

Meaning: 'Belief' refers to a strong conviction or acceptance that something is true or exists.

Wrong options:

• submitted: 'Submitted' is a verb that does not fit as it does not convey a sense of conviction or idea.
• evenly: 'Evenly' is an adverb that does not relate to the concept of belief or conviction.
• announced: 'Announced' is a verb that does not fit as it does not convey the idea of a belief or conviction.

Correct answer: boost

Explanation: The word 'boost' is a verb that means to increase or improve something. It fits grammatically and contextually as it describes the action needed to enhance China's economy.

Meaning: To 'boost' means to increase or improve something, particularly in terms of performance or effectiveness.

Wrong options:

• evenly: 'Evenly' is an adverb that does not convey the action of increasing or improving an economy.
• belief: 'Belief' is a noun that does not fit as it does not describe an action related to economic improvement.
• balance: 'Balance' is a noun or verb that does not convey the action of enhancing or increasing.

Correct answer: shifted

Explanation: The word 'shifted' is the past tense of the verb 'shift,' which indicates a change in direction or focus. It fits grammatically and contextually as it describes the change in economic policy towards foreign trade and investment.

Meaning: To 'shift' means to change or move from one position to another.

Wrong options:

• submitted: 'Submitted' does not fit as it implies presenting something rather than changing a policy.
• evenly: 'Evenly' is an adverb that does not relate to the action of changing or shifting a policy.
• boost: 'Boost' is a verb that does not convey the idea of changing direction or focus.

Correct answer: truly

Explanation: The word 'truly' is an adverb that emphasizes the authenticity or reality of the statement. It fits contextually as it underscores the significance of the turning point in China's economic history.

Meaning: 'Truly' means in a truthful or genuine manner, emphasizing the reality of the statement.

Wrong options:

• submitted: 'Submitted' does not fit as it implies presenting something rather than emphasizing a statement.
• evenly: 'Evenly' is an adverb that does not convey the idea of authenticity or truthfulness.
• belief: 'Belief' is a noun that does not fit as it does not emphasize the reality of the statement.