Sentence 1: Susan usually never takes the bus, but one day her car broke down. 
 Sentence 3: Susan and this individual had a fascinating conversation 
 Sentence 4:  They exchanged email addresses and phone numbers to stay in touch 
 Sentence 5:  Susan wonders if perhaps she should ride the bus more often 
 Given Sentence 2: He started to go out the door before he noticed it was raining.