Answer:
The words in the above excerpt demonstrate a humorous or lighthearted tone are "all things new", "curiosity", "caution", "harmless", "a stranger’s child"
Step-by-step explanation:
The Chapter 1 of I Know Why the Caged Bird Sings by Maya Angelou, introduces how the two little siblings started their journey to their new life, and in this specific excerpt, it is shown through the use of the words "all things new", "curiosity", "caution", "harmless", "a stranger’s child" the humorous tone of its lines by presenting them as something more than little kids who the reader might find fun to see how the people in town were afraid of.