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.

[EX Q]: I was listening to some music while swimming with my phone and headphone but the headphone later stopped working. The _ is waterproof.
[EX A]: phone

[EX Q]: They were going to use some different numerals instead of regular numbers, since the _ were strange.
[EX A]: numerals

[EX Q]: The payments that I put toward my bills weren't enough, because the _ were too expensive.
[EX A]:
bills