Sentence 1: Frank went to call his boss to inform her that he was sick. 
 Sentence 3: His phone malfunctioned and he couldn't use it 
 Sentence 4:  Without any way of calling in, Frank went to work sick 
 Sentence 5:  Frank got everyone in the office sick too 
 Given Sentence 2: He picked up his phone but dropped it immediately into the sink.