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Explanation:

Question 18

From the text, it says "Most historians agree that the most likely cause of his death was a stroke induced by the bullet still lodged in his neck from the assassination attempt." So we extract this information to answer.

(Note: The given text doesn't provide information about who Lenin warned other Communists about. So we can't answer this from the provided text. But if we assume general knowledge, Lenin warned about Stalin in his testament, but since the text here doesn't have it, we state that the provided text doesn't contain this info. However, if we must answer based on possible general context, historically Lenin warned about Stalin's power - seeking tendencies. But strictly from the given text, there's no info. )

• Option (1): The Bolshevik Revolution in 1917 established the first Communist economic system in Russia, which was a major historical turning point.
• Option (2): There were many revolutions in the 20th century after 1917, so this is wrong.
• Option (3): Russia remained an important force in world affairs after the revolution.
• Option (4): The royal family was executed, not exiled to Mexico.

Answer:

Lenin died from a stroke induced by the bullet still lodged in his neck from the assassination attempt.

Question 19