Final answer:
To sound more professional in the workplace, employees should avoid upspeak, which involves making declarative sentences sound like questions.
Step-by-step explanation:
To sound more professional in the workplace, employees should avoid a speech pattern known as upspeak, which involves making declarative sentences sound like questions. This can undermine the speaker's credibility and may come across as uncertain or unsure. Instead, employees can use assertive and confident language to project professionalism and expertise.