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The answer is: Number
The pronoun must agree with its antecedent in number. Rule: A singular pronoun must replace a singularnoun; a plural pronoun must replace a plural noun. A pronoun should agree with its antecedent in person, number, and gender. Person refers to the quality of being, number distinguishes between singular and plural.
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to make a slave or slaves of; reduce to or as if to slavery: to enslave a people; enslaved by drugs.
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About a pirate who is lazy and clumsy
The answer is
B. They eat and remove crop-damaging grubs.
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