Sentence 1: During the last period of the day, an announcement was made. 
 Sentence 3: A pep rally began when several cheerleaders started cheering 
 Sentence 4:  Afterwards, several people from the step team started to dance 
 Sentence 5:  They were dancing for a total of 10 minutes 
 Given Sentence 2: All of the 11th grade students came into the gymnasium.