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.

Elaine took the painkillers that were in the medicine bottle for her back pain until the _ was empty.
bottle

My new routine was going to fit in my schedule, because the _ was very empty.
schedule

The weightlifter felt a lot more tough when working with barbells than with kettlebells, because the _ worked more complex muscle groups.

barbells