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.

Example Input: While the man modified the height of the bike, the boy rode the tricycle, because the _ was the incorrect height.
Example Output: bike

Example Input: The kids abused the slides in the playground, but took better care of the swings.  They just thought the _ were a terrible ride.
Example Output: slides

Example Input: I have sleep apnea which means I need to improve the ventilation in my home through the windows and closet doors.  I open the _ to improve oxygen levels.
Example Output:
windows