Sentence 1: Joan's son ran in the house saying a squirrel had bitten him. 
 Sentence 3: The doctor said she should catch the squirrel, which could be rabid 
 Sentence 4:  Joan chased the squirrel around the yard and up a tree 
 Sentence 5:  When she fell, she ended up at the doctor without the squirrel 
 Given Sentence 2: Worried, Joan called the doctor.