Final answer:
To add a word to your vocabulary, be sure to add it into your speech.
Step-by-step explanation:
The most accurate statement regarding the speaking-writing connection is that to add a word to your vocabulary, be sure to add it into your speech.
When we use words in our speech, we become more comfortable and familiar with them, which helps expand our vocabulary. By incorporating new words into our everyday conversations, we are more likely to retain and use them effectively in writing.