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.

She was deciding how to track her cycle either through an app or a journal.  The _ was on digital.
app

The drifter pulled out his harmonica while riding the train and played a tune over the _ noise.
train

Joey wanted to keep his pet fox in his fence outside so he paid the permit fee but the _ was too high.

permit fee