Sentence 1: Will took a square of sandpaper from the pile. 
 Sentence 3: The shop teacher nodded on in approval 
 Sentence 4:  Will continued working diligently for the whole period 
 Sentence 5:  He was happy that he decided to take shop class instead of art 
 Option 1: He began sanding an old piece of barn wood. 
 Option 2: He sanded the rusty areas until the metal was exposed.