In this task, you are given a sentence. You must judge whether a single noun or verb has been replaced with another word with the same part of speech. The inversion would result in the sentence sounding unnatural, So unnatural sentences will be considered changed. Label the instances as "Original" or "Changed" based on your judgment.

The other students were determined to master the representative and then never use it again .
Changed

It is naïve and hopeful to think that they would all testify for peace with us .
Changed

It shook its massive head and pawed at its face .

Original