b
32. **How did William Addis invent the toothbrush?**
William Addis invented the toothbrush by taking a small bone, making some small holes in it, and then putting some thin hard pieces of plastic in the holes.
33. **Was William Addis an ordinary person?**
Yes, William Addis was an ordinary person.
34. **Only a clever person can invent new things.**
b. False
