Sentence 1: Part of Mark's job was to train all the new people at the restaurant. 
 Sentence 3: She was shy on the phones and wasn't polite greeting guests 
 Sentence 4:  Mark decided that she was not cut out for this job so he fired her 
 Sentence 5:  Gina was sad and vowed to find a job she is good at 
 Given Sentence 2: Today Mark had to train Gina to be the hostess.