To determine where "who" should be replaced with "whom," we need to understand the grammatical roles of these pronouns. "Who" is used as a subject, while "whom" is used as an object.
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Who do you think should be the next president of the science club?
- "Who" is the subject of the clause "do you think." No change is needed.
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The water from the faucet has turned brown, but I'm not sure who to call about it.
- "Who" is the object of the verb "to call." It should be replaced with "whom."
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Who wants to help clean the pool so that it will be ready when summer begins?
- "Who" is the subject here. No change is needed.
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Dorothy is a professional pastry chef who can bake a great Chantilly tart.
- "Who" is the subject of the clause. No change is needed.
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Bryan, who loves playing soccer, was disappointed when he was cut from the team.
- "Who" is the subject here. No change is needed.
Thus, the sentences that need "who" to be replaced with "whom" are:
- The water from the faucet has turned brown, but I'm not sure who to call about it. (should be "whom")
- The other sentence eligible for correction does not exist since only one needs correction in this selection.
So, only the second sentence is correct for change.
In this context, the correct answer is:
- The water from the faucet has turned brown, but I'm not sure whom to call about it.