The answer that you're looking for is Stunning.
Answer:
none
Explanation:
sorry but I don't see any sentences apart from the question
1. "Workers" and "tables" are both nouns, because they describe a group of people (workers) and a group of things (tables)
2. I may be right or wrong, but I believe "workers" is the subject in the sentence
The speaker uses a mic/microphone so that the audience can clearly hear him or her.