Sentence 1: Sara was walking in front of her high school. 
 Sentence 3: Sara excitedly started running toward her friend 
 Sentence 4:  As she ran, her heavy backpack bounced against her 
 Sentence 5:  She ended up tripping and falling on the sidewalk 
 Option 1: Her best friend called to her from down the road. 
 Option 2: She noticed her childhood friend from afar.