What is the best meaning for the verb turn as it is used in this passage

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What is the meaning of the word checking as it is used in this sentence from the second paragraph of the passage?

Avenn diagram would be best to take notes on which of the following informational passages? a).pet ownership improves life. b).active reading improves test scores. c).will weights or walking keep you fit? d).the day before mount ruapehu erupted.