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One way to determine the correct answer in this sentence is to figure out the part of speech of the missing word. The missing word in this sentence is an adjective because it modifies the noun “nature.” Another clue in this sentence is the key word “volunteer.” A volunteer is someone who offers her time or skills without pay. The blank will be an adjective with a positive connotation that describes the type of person who volunteers. By knowing that the blank must describe someone who offers her time or skills without pay, you can predict that the correct answer will be similar to “helpful.” ​Quickly review the six answer choices to see which two words most closely match “helpful,” which in this case are choice (C) altruistic and choice (F) benevolent.