Sentence 1: Mary had to write an essay for English class. 
 Sentence 3: Working hard, she completed forty pages of her essay 
 Sentence 4:  Her little sister came in and pressed a button, deleting it all 
 Sentence 5:  After Mary stopped crying, she got back to work on her essay 
 Option 1: She went to the library to use their computer. 
 Option 2: She went to her father's study to use his computer.