Sentence 1: Tim was trying to put together a bicycle in his garage. 
 Sentence 3: Tim looked through his tool box for the screwdriver 
 Sentence 4:  Alas, all Tim had was a flat head screwdriver 
 Sentence 5:  He tried to install it with his fingers but ultimately failed 
 Given Sentence 2: He needed to install some screws with a hex head.