Random Riddle: 10-2-2012

Acres, Cares, Races, Scare
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The same five letters can be anagrammed into four different words that fill in the blanks in the sentence to make (somewhat) good sense. What are the missing words if the sentence is…

‘The farmer with hundreds of _ _ _ _ _ of land, deeply _ _ _ _ _ about the amount of rainfall, and _ _ _ _ _ around with artificial watering systems when the ground is dry enough to _ _ _ _ _ him about the possibility of crop failure.’