Meaning: 'American' refers to something related to the United States, in this case, indicating the dictionary is of American origin or usage.

Wrong options:

• Mettlesome: Mettlesome means spirited or courageous, which does not relate to the context of a dictionary type.
• Silicon: Silicon refers to a chemical element or is often associated with technology, not relevant to describing a dictionary.
• Acetaminophen: Acetaminophen is a medication used to relieve pain and reduce fever, which is unrelated to the context of dictionaries.

Correct answer: dictionaries

Explanation: The word 'dictionaries' is the correct plural noun that fits the context, as it refers to the books that compile words and their meanings, which is what the sentence discusses.

Meaning: 'Dictionaries' are reference books that list words in alphabetical order and provide their meanings, pronunciations, and other information.

Wrong options:

• veterinaries: Veterinaries refers to veterinarians or animal doctors, which does not fit the context of language and books.
• fairies: Fairies are mythical beings, which are irrelevant in the context of discussing language and dictionaries.
• smithies: Smithies refer to places where metal is worked, which does not relate to the topic of dictionaries.

Correct answer: eventually

Explanation: The word 'eventually' is an adverb that indicates something will happen at some point in the future, fitting grammatically and contextually as it describes the timeline of politicians' fame compared to actors.

Meaning: 'Eventually' means at a later time or after a while, indicating that politicians' fame can surpass that of actors after some time.

Wrong options:

• intelligibly: Intelligibly means in a way that can be understood, which does not fit the context of discussing fame.
• venturesomely: Venturesomely means in a daring or adventurous manner, which is not relevant to the context of fame.
• preferably: Preferably indicates a choice or preference, which does not align with the context of fame progression.

Correct answer: available

Explanation: The word 'available' is an adjective that describes the Google tool as being accessible to users, fitting grammatically and contextually in the sentence.

Meaning: 'Available' means that something can be used or obtained, indicating that the tool can be accessed by users.

Wrong options:

• nonoccupational: Nonoccupational means not related to a job or profession, which does not fit the context of describing a tool.
• nonbreakable: Nonbreakable means something that cannot be broken, which is irrelevant in the context of a digital tool.
• trainable: Trainable refers to something that can be trained or taught, which does not apply to the context of availability.

Correct answer: frequency

Explanation: The word 'frequency' is a noun that fits grammatically and contextually, as it refers to how often a word or phrase appears, which is the focus of the sentence.

Meaning: 'Frequency' means the rate at which something occurs over a particular period of time, in this case, the occurrence of words or phrases in literature.

Wrong options:

• derisory: Derisory means something that is laughably small or inadequate, which does not fit the context of measuring word usage.
• drearily: Drearily means in a dull or bleak manner, which is not relevant to the context of word frequency.
• inappreciably: Inappreciably means in a way that is too small to be noticed, which does not align with the context of tracking word usage.