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Question:
In order to correct sentence 8, you should change \u201Cto digits\u201D to \u201Ctwo digits.\u201D The sentence is requiring the use of the number 2, which is spelled two, not to. The sentence does not require a comma after \u201Cconcentrations\u201D to make it grammatically correct. The pronoun \u201Cthat\u201D is used correctly, as it refers to \u201Cdigits\u201D in a restrictive clause (not set off with commas). The plural form of \u201Ccenters\u201D is used correctly to refer to multiple locations.
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