Sentence 1: Mike and Cathy went canoeing on the river. 
 Sentence 3: A water snake started swimming toward them 
 Sentence 4:  Cathy screamed in terror 
 Sentence 5:  Mike and Cathy paddled as fast as they could to get away 
 Option 1: They paddled down the water past rocks and trees. 
 Option 2: The crashed into some rocks and trees.