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]: John ran into the room from the balcony when he started to shiver. The _ is warm.
[EX A]: room

[EX Q]: Jackson liked to do his swimming kick with flippers instead of swim shoes, because the _ were comfortable.
[EX A]:
flippers