Definition: 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.

Positive Example 1 -
Input: PersonX sees ___ in the wild
Output: tiger

Positive Example 2 -
Input: PersonX spends ___ listening
Output: money

Negative Example 1 -
Input: PersonX spends ___ listening
Output: Bag

Negative Example 2 -
Input: PersonX sees ___ in the wild
Output: clock

Now complete the following example -
Input: PersonX uses ___ to estimate
Output: rulers, a ruler, calculators, a calculator