Empty words are the words that do not add any meaning to the structure of the sentence. They may be used to add a subjective tone to the sentence but they do not alter the original meaning .
I like to sail when it’s breezy. This is the correct option. The sentence is plain without any emphatic / subjective expression.
These options have empty words:
-I like to sail when it’s very breezy. The underlined word is qualifying breezy.
-I really like to sail when it’s breezy. Really means in fact, it sets the focus on the speaker's opinion.
- I really like to sail when it’s very breezy. Two emphatic or empty words are used.