Sentence 1: Alex was walking home from school. 
 Sentence 3: He looked in his backpack and saw that his soda has spilled 
 Sentence 4:  The sticky liquid had gotten everywhere 
 Sentence 5:  Alex had to empty out his whole bag and wash it 
 Option 1: Suddenly, he noticed something wet on his back. 
 Option 2: Suddenly he noticed something crawling on his back.