You need to answer a given question containing a blank (_). Your answer must be one of the two objects mentioned in the question, for example "trophy" and "suitcase". Your answer must not contain a word that is not present in the question. Please don't use articles (e.g., the, a) before the answer.

[Q]: Jenna added chlorine gradually to her pool, because she wanted to make sure that the _ was making it cleaner.
[A]: chlorine


[Q]: Jack turned on the fan in the bathroom, but the odor was still there after 30 minutes. The _ was weak.
[A]: fan


[Q]: The dog could not run and jump over the fence because the _ is too tall.
[A]:
fence