Final answer:
The City of Oakwood, which was established in 1907, is now a significant suburb of Dayton. My boss gave me a bonus at the end of the year (because he was so pleased with my work).
Step-by-step explanation:
The two sentences that are punctuated correctly are:
- The City of Oakwood, which was established in 1907, is now a significant suburb of Dayton. The commas are correctly used to set off the nonessential information about the City of Oakwood.
- My boss gave me a bonus at the end of the year (because he was so pleased with my work). The parentheses are correctly used to enclose the additional information about the reason for the bonus.