Sentence 1: Frank and Tina were at her family's house for Christmas. 
 Sentence 3: People all guessed what the news was, but no one was right 
 Sentence 4:  Finally, Tina announced that she was pregnant 
 Sentence 5:  Everyone at the party cheered for her and laughed 
 Given Sentence 2: Since I wasn't looking at my feet, I stepped on a rock.