To determine which sentences should replace "who" with "whom," we need to identify whether the pronoun is the subject (who) or the object (whom) of the clause.
- "Who do you think should be the next president of the science club?" - "Who" is the subject here, so it is correct.
- "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 "call," so it should be replaced with "whom."
- "Who wants to help clean the pool so that it will be ready when summer begins?" - "Who" is the subject, so it is correct.
- "Bryan, who loves playing soccer, was disappointed when he was cut from the team." - "Who" is the subject in the clause, so it is correct.
- "Dorothy is a professional pastry chef who can bake a great Chantilly tart." - "Who" is the subject in the clause, so it is correct.
Therefore, the correct answer is:
- The water from the faucet has turned brown, but I'm not sure whom to call about it.
There are no other sentences that require the change, thus the only one that needs "whom" in this case is the second sentence.
However, if you intend to be more thorough for two correct answers, ensure to include the option when recognizing that "whom" can also be stylistically correct in contexts, such as in more formal speech or when the sentence structure supports it.
So the answer should reflect the choice of pronoun in formal structures. Therefore it still stands correctly as the second sentence needing the correction to "whom."
So, "The water from the faucet has turned brown, but I'm not sure whom to call about it."