Meaning: 'Racing' refers to thoughts that are moving quickly, often in a chaotic or anxious manner.

Wrong options:

• guilty: 'Guilty' is an adjective that describes a feeling of remorse, which does not fit the context of mental activity.
• breaks: 'Breaks' is a noun or verb that does not appropriately describe the state of the mind in this context.
• reflecting: 'Reflecting' is a gerund that implies thoughtful consideration, which contrasts with the chaotic nature of 'racing' thoughts.
• faint: 'Faint' is an adjective that describes a physical state of weakness, not a mental state.

Correct answer: kicks

Explanation: The verb 'kicks' is in the present tense and indicates the initiation of a response by the sympathetic nervous system. It fits grammatically and contextually as it describes an active process that occurs in response to the mental state described in the first blank.

Meaning: 'Kicks' means to start or activate something suddenly, in this case, the body's response to perceived threats.

Wrong options:

• breaks: 'Breaks' implies a cessation of action, which contradicts the idea of the nervous system responding actively.
• guilty: 'Guilty' is an adjective that does not fit as it does not describe an action taken by the nervous system.
• reflecting: 'Reflecting' suggests a passive state of thought, which does not align with the active response of the nervous system.
• faint: 'Faint' is an adjective that describes a physical state and does not convey an action.

Correct answer: faint

Explanation: The word 'faint' is an adjective that describes a physical sensation of weakness or lightheadedness. It fits grammatically as it describes the state of the body in response to the previous actions described in the sentence.

Meaning: 'Faint' refers to feeling weak or dizzy, often as a result of stress or anxiety.

Wrong options:

• guilty: 'Guilty' is an adjective that describes a feeling of remorse, which does not fit the context of physical sensations.
• breaks: 'Breaks' does not fit as it is a noun or verb that does not describe a physical state of feeling.
• racing: 'Racing' is a gerund that describes thoughts, not a physical state, making it inappropriate here.
• kicks: 'Kicks' is a verb that describes an action, not a state of feeling.