Identify which of these comma rules is used in each sentence.
Long Introductory Element | Appositive | Items in a Series | Compound Sentence
Mom flew to Chicago and landed at O’Hare International Airport, one of the busiest airports in the U. S. _______________________
If I win tickets to the concert, I will go with my best friend. _________________
We visited many of Rome’s landmarks, but we didn’t get into the Colosseum. ___________________________
Leo ran down the block, across the street, through the park, and into the library. ___________________________