Respuesta :
Look up words you do not know in a dictionary or thesaurus is the way to find the unfamiliar words and Stop and think strategy need the coma after the stop.
What is the meaning of thesaurus?
A book of synonyms is a book containing words or information about a given topic or group of concepts.
A list of subject headings or descriptors, usually with a cross-reference system, for use in organizing and retrieving a collection of documents.
Thus, In 1st phrase option C and in 2nd phrase option A are correct.
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