Sentence 1: Smear was baking a cake for his sister. 
 Sentence 3: He opened the cupboard and reached for the bag of sugar 
 Sentence 4:  However, he slipped and stumbled across the kitchen floor 
 Sentence 5:  The bag of sugar opened and spilled everywhere 
 Option 1: The next step required one cup of sugar. 
 Option 2: The next step required one cup of flour.