Answer:
If by paragraph4 you mean the: When I replied, “Not much,” she sang out, like a happy little bird, “Oh, Natalie! I have a surprise,” and reached under the table to pull out a huge, flat box. When I opened it, I gasped and burst into tears. Then the answer is Simile
Step-by-step explanation:
"She sang out, like a happy little bird"
The key word was LIKE, which shows that it is a simile. It compares her singing out and the song of a happy little bird.