Meaning: 'Strung' refers to being in a state of tension or anxiety, often due to drug use.

Wrong options:

• slung: 'Slung' is the past participle of 'sling,' which does not convey the intended meaning of being tense or anxious in this context.
• academic: 'Academic' is an adjective that relates to education or scholarly pursuits, which does not fit the context of describing a person's emotional state.
• matter: 'Matter' is a noun that refers to a subject or topic, which does not relate to the emotional state of the person described.
• substances: 'Substances' is a noun that refers to drugs or materials, but it does not describe the person's state of being.
• dental: 'Dental' is an adjective related to teeth, which is irrelevant to the emotional context of the sentence.
• purpose: 'Purpose' is a noun that refers to an intention or goal, which does not fit the description of the person's state.

Correct answer: dental

Explanation: The term 'dental' is an adjective that specifically relates to teeth and dental health. It fits grammatically and contextually as it describes the type of check-up the person might have, which is relevant in the context of health services provided at the center.

Meaning: 'Dental' refers to anything related to teeth or oral health.

Wrong options:

• academic: 'Academic' is an adjective related to education, which does not fit the context of a health check-up.
• purpose: 'Purpose' is a noun that refers to an intention or goal, which does not describe a type of check-up.
• matter: 'Matter' is a noun that refers to a subject or topic, which is not applicable in the context of a health check-up.
• strung: 'Strung' is a past participle that describes a state of tension, which does not relate to a type of medical check-up.
• substances: 'Substances' is a noun referring to drugs or materials, which does not fit the context of a dental check-up.
• slung: 'Slung' is a past participle of 'sling,' which does not relate to health or check-ups.

Correct answer: substances

Explanation: The word 'substances' is a plural noun that refers to drugs or materials that individuals may be dependent on. It fits grammatically and contextually as it describes what the majority of people are dependent on, aligning with the discussion of drug use.

Meaning: 'Substances' refers to drugs or materials that people may consume or use, particularly in the context of addiction.

Wrong options:

• academic: 'Academic' is an adjective related to education, which does not fit the context of drug dependency.
• purpose: 'Purpose' is a noun that refers to an intention or goal, which does not describe what people are dependent on.
• matter: 'Matter' is a noun that refers to a subject or topic, which is not relevant to the context of drug dependency.
• strung: 'Strung' is a past participle that describes a state of tension, which does not relate to what people are dependent on.
• dental: 'Dental' is an adjective related to teeth, which is irrelevant to the context of substance dependency.
• slung: 'Slung' is a past participle of 'sling,' which does not fit the context of describing dependency.

Correct answer: purpose

Explanation: The term 'purpose' is a noun that refers to the intention or goal of the center. It fits grammatically and contextually as it describes the main aim of the facility, which is to keep people alive, aligning with the overall message of the text.

Meaning: 'Purpose' refers to the reason for which something is done or created.

Wrong options:

• academic: 'Academic' is an adjective related to education, which does not fit the context of the center's intention.
• matter: 'Matter' is a noun that refers to a subject or topic, which does not describe the center's goal.
• strung: 'Strung' is a past participle that describes a state of tension, which does not relate to the intention of the center.
• substances: 'Substances' is a noun referring to drugs, which does not describe the center's purpose.
• dental: 'Dental' is an adjective related to teeth, which is irrelevant to the purpose of the center.
• slung: 'Slung' is a past participle of 'sling,' which does not fit the context of describing the center's goal.