The sentence to complete is: None are so ______ as those who are full of themselves.
We are provided with four options to fill in the blank:
- empty
- important
- vital
- indispensible
The phrase "those who are full of themselves" refers to people who are self-centered or overly proud. Therefore, the most suitable word to contrast with this phrase is "empty," as it suggests a lack of substance beyond their self-perceived importance.
So, the completed sentence is: None are so empty as those who are full of themselves.
This implies that the self-important individuals may lack genuine content or substance.