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.
--------
Question: I was listening to some music while swimming with my phone and headphone but the headphone later stopped working. The _ is waterproof.

Answer: phone


Question: The sound of the speaker put a crack on the window close to it because the _ is too strong.

Answer: sound


Question: Mark chose to buy his girlfriend the purse with hearts on it instead of the one with stars, but he realized she would have preferred the _ .

Answer:
stars