Meaning: 'Severe' means very great or intense, indicating that the economic downturn was extremely serious and impactful.

Wrong options:

• guilty: The word 'guilty' refers to a legal or moral fault and does not apply to describing an economic situation.
• intrinsic: 'Intrinsic' means belonging naturally; essential, which does not convey the severity of the economic downturn.
• tolerable: 'Tolerable' suggests something that can be endured, which contradicts the context of describing a significant economic crisis.

Correct answer: domestic

Explanation: The term 'domestic' is appropriate as it refers to conditions within a country, which is relevant when discussing the causes of the Great Depression. It fits grammatically and contextually, as it contrasts with international factors.

Meaning: 'Domestic' means relating to the home or internal affairs of a country, indicating that some causes of the Great Depression were internal to the U.S.

Wrong options:

• refined: 'Refined' suggests something that has been improved or purified, which does not apply to the context of economic conditions.
• sporadic: 'Sporadic' means occurring at irregular intervals, which does not accurately describe the ongoing conditions leading to the Great Depression.
• remote: 'Remote' implies something distant or far away, which does not fit the context of immediate economic conditions.

Correct answer: undermine

Explanation: The verb 'undermine' fits well as it indicates a gradual weakening of economic stability and confidence, which aligns with the context of the sentence. It is grammatically correct and contextually appropriate.

Meaning: 'Undermine' means to weaken or damage something gradually, which accurately describes the effect of the conditions on economic stability.

Wrong options:

• capsize: 'Capsize' refers to overturning a boat, which is not relevant in the context of economic stability.
• underline: 'Underline' means to emphasize or highlight, which does not convey the negative impact intended in this context.
• devise: 'Devise' means to plan or invent, which does not fit the context of causing damage to economic stability.

Correct answer: underwent

Explanation: The verb 'underwent' is appropriate as it indicates that the stock market experienced a process of expansion. It fits grammatically and contextually, as it describes a significant change over time.

Meaning: 'Underwent' means to experience or endure something, indicating that the stock market went through a period of expansion.

Wrong options:

• moderated: 'Moderated' suggests a reduction or control, which contradicts the idea of expansion in this context.
• defaulted: 'Defaulted' refers to failing to fulfill an obligation, which does not apply to the context of market growth.
• constructed: 'Constructed' means built or created, which does not accurately describe the process of market expansion.

Correct answer: where

Explanation: The word 'where' is suitable as it introduces a clause that provides additional information about margin buying. It fits grammatically and contextually, linking the action of borrowing money to the location of that action in the market.

Meaning: 'Where' indicates a place or situation, in this case referring to the context of margin buying in the stock market.

Wrong options:

• which: 'Which' is a relative pronoun that does not fit the grammatical structure needed to introduce the clause about margin buying.
• although: 'Although' is a conjunction used to introduce a contrast, which does not fit the context of providing additional information.
• then: 'Then' indicates a sequence in time, which does not appropriately connect the ideas in this context.