Meaning: 'Affect' means to have an influence on or make a change to something.

Wrong options:

• effect: 'Effect' is a noun that refers to a result or outcome, which does not fit grammatically as the sentence requires a verb.
• implications: 'Implications' is a noun that refers to possible effects or results, which does not fit as it does not serve as a verb in this context.
• applications: 'Applications' is a noun that refers to practical uses, which does not fit as it does not serve as a verb in this context.
• flames: 'Flames' is a noun that refers to the visible, gaseous part of a fire, which does not fit as it does not relate to the influence on society.
• tears: 'Tears' is a noun that refers to drops of clear, salty liquid produced by the eyes, which does not fit as it does not relate to the influence on society.

Correct answer: applications

Explanation: The term 'applications' is a noun that refers to practical uses or functions of helium in various fields, fitting grammatically as it follows the phrase 'many vital' and aligns with the context of discussing helium's importance.

Meaning: 'Applications' refers to the practical uses or functions of something, in this case, helium.

Wrong options:

• effect: 'Effect' is a noun that refers to a result or outcome, which does not fit as it does not describe a use or function of helium.
• affect: 'Affect' is a verb that indicates influence, which does not fit as it does not describe a use or function of helium.
• implications: 'Implications' is a noun that refers to possible effects or results, which does not fit as it does not describe a use or function of helium.
• flames: 'Flames' is a noun that refers to the visible part of a fire, which does not fit as it does not describe a use or function of helium.
• tears: 'Tears' is a noun that refers to drops of liquid from the eyes, which does not fit as it does not describe a use or function of helium.

Correct answer: flames

Explanation: The word 'flames' is a noun that refers to the visible, gaseous part of a fire, fitting grammatically as it serves as the object of the preposition 'into' and aligns with the context of describing the catastrophic event involving the airship.

Meaning: 'Flames' refers to the visible part of a fire, indicating the destructive nature of the incident.

Wrong options:

• effect: 'Effect' is a noun that refers to a result or outcome, which does not fit as it does not describe a physical state of fire.
• affect: 'Affect' is a verb that indicates influence, which does not fit as it does not describe a physical state of fire.
• implications: 'Implications' is a noun that refers to possible effects or results, which does not fit as it does not describe a physical state of fire.
• applications: 'Applications' is a noun that refers to practical uses, which does not fit as it does not describe a physical state of fire.
• tears: 'Tears' is a noun that refers to drops of liquid from the eyes, which does not fit as it does not describe a physical state of fire.