Sentence 1: Jack grew tired of waiting for help as he eyed the large box. 
 Sentence 3: As he lifted it alone, he felt something pull in his back 
 Sentence 4:  Jack had to go to massage therapy that afternoon 
 Sentence 5:  He arrived home much later than normal 
 Option 1: The sooner that was put away the sooner he could go home. 
 Option 2: He asked a stranger passing by to help him lift it.