Meaning: 'Promise' means to assure someone that something will happen or be done, in this case, high profits.

Wrong options:

• state: The word 'state' is a verb that means to express something clearly, which does not fit the context of assuring profits.
• alter: The word 'alter' is a verb meaning to change something, which does not relate to the act of assuring profits in this context.
• exercise: The word 'exercise' is a verb that means to engage in physical activity or to apply something, which does not fit the context of making promises.
• returns: The word 'returns' is a noun referring to profits or income received, which does not fit as a verb in this context.
• items: The word 'items' is a noun that refers to objects or things, which does not fit the context of making a promise.

Correct answer: returns

Explanation: The word 'returns' fits grammatically as a noun that refers to the profits paid to earlier investors. It is contextually appropriate as it describes the outcome of the fraudulent schemes.

Meaning: 'Returns' refers to the profits or income received from an investment.

Wrong options:

• state: The word 'state' is a verb that does not fit as a noun in this context, as it does not refer to profits.
• alter: The word 'alter' is a verb meaning to change something, which does not relate to the concept of profits or payments.
• promise: The word 'promise' is a verb that does not fit as a noun in this context, as it does not refer to profits.
• items: The word 'items' is a noun that refers to objects or things, which does not fit the context of financial returns.

Correct answer: exercise

Explanation: The word 'exercise' fits grammatically as a verb that means to take action or apply caution. It is contextually relevant as it advises investors to be careful.

Meaning: 'Exercise' means to take action or apply something, in this case, caution.

Wrong options:

• state: The word 'state' is a verb that means to express something clearly, which does not fit the context of taking caution.
• alter: The word 'alter' is a verb meaning to change something, which does not relate to the act of applying caution.
• returns: The word 'returns' is a noun referring to profits, which does not fit as a verb in this context.
• items: The word 'items' is a noun that refers to objects or things, which does not fit the context of taking action.

Correct answer: diligence

Explanation: The word 'diligence' fits grammatically as a noun that refers to careful and persistent work or effort. It is contextually appropriate as it emphasizes the need for thorough investigation before investing.

Meaning: 'Diligence' refers to careful and persistent effort or work, especially in the context of research or investigation.

Wrong options:

• state: The word 'state' is a verb that does not fit as a noun in this context, as it does not refer to careful effort.
• alter: The word 'alter' is a verb meaning to change something, which does not relate to the concept of careful investigation.
• returns: The word 'returns' is a noun referring to profits, which does not fit as a noun describing effort or investigation.
• items: The word 'items' is a noun that refers to objects or things, which does not fit the context of careful effort.