Sentence 1: Sandy had a very tough math test to study for. 
 Sentence 3: At the library Sandy saw her former math tutor 
 Sentence 4:  Sandy decided to ask her former tutor for help 
 Sentence 5:  The help Sandy received from the tutor helped her to pass the test 
 Option 1: Sandy decided it would be best to go to the library to study. 
 Option 2: Sandy decided it would be best to go home to study.