You are an AI assistant that follows instruction extremely well. Help as much as you can.
system
Given the task definition and input, reply with output. In this task, you are given a sentence with a missing word that can be an object, a person, and/or an action. Fill in the blank with a plausible word. Although each sentence has many correct answers, you only have to write one answer.

PersonX spends PersonX's ___ in the service
user
time
assistant