Select the most appropriate option that can substitute the underlined segment in the given sentence. If there is no need to substitute it, select 'No substitution'.

Finally, here are a few examples of passages and their precis.

The correct answer is "No substitution"

Key Points

• The challenge here is to select the option that can aptly substitute the underlined portion of the sentence "Finally, here are a few examples of passages and their precis."
• Let's evaluate the alternatives:
  • "By passages and their precis": 'By' doesn't fit the context here. The intent of the sentence is to introduce 'examples', and hence 'of' is appropriate.
  • "Of passages and there precis": 'There' is incorrect in this context. 'Their' should be used as a possessive pronoun referring to 'examples'.
  • "Of passages and there precises": Here again, 'there' is incorrect. Also, 'precises' is not the correct form of the word. The correct word is 'precis', whether in singular or plural.
  • "No substitution": This means the underlined portion is already perfect and requires no change.
• Given the context of the sentence and the alternatives provided, it seems that the underlined phrase "of passages and their precis" is correct as is, and does not require any substitution.
• Thus the correct option is 'No substitution'.
• The term 'precis' is a concise summary of an article or speech, and 'their' is correctly used as a possessive adjective referring back to 'examples'.
• The original sentence is correct grammatically and contextually.

Therefore, the correct answer is "Option 4".