Which sentence needs proofreading? a) the english teacher sat down at his desk and sighed, he had so many essays to grade. b) when the repairman lifted up the carpet, he was shocked to find a layer of 50 dollar bills. c) unable to believe that anyone would listen his tale, the three-year-old boy decided to lie. d) cherie was a black labrador that lived next door to the gundersons and barked all night long.