Identify which of these comma rules is used in each sentence. (4 points)

Question

Put responses in the correct input to answer the question. Select a response, navigate to the desired input and insert the response. Responses can be selected and inserted using the space bar, enter key, left mouse button or touchpad. Responses can also be moved by dragging with a mouse.
Leo ran down the block, across the street, through the park, and into the library.
If I win tickets to the concert, I will go with my best friend.
We visited many of Rome's landmarks, but didn't get into the Colosseum.
Mom flew to Chicago and landed at O'Hare International Airport, one of the busiest airports in the U. S.

Answer 1

1. Leo ran down the block, across the street, through the park, and into the library.
   Comma in a series.

2. If I win tickets to the concert, I will go with my best friend.
   Comma in a complex sentence.

3. We visited many of Rome's landmarks, but didn't get into the Colosseum.
   Comma in a compound sentence.

4. Mom flew to Chicago and landed at O'Hare International Airport, one of the busiest airports in the U. S.
   Comma for an explanatory phrase.