It’s true because your teacher says so
There are three adverbs: quietly, heavily, surprise.
Answer: when the writer uses a group of words that does not express a complete thought
• State the central idea in your own words.
• Begin with the central idea and then include a few key details.
• Include all the details and examples given in the speech.
Terribly sorry if one of them ends up being wrong. However, I hope I was of help.