C h oo s e t h e w o r d o r ph r a s e t h a t c a n r e p l a c e t h e u nd e r li n e d p a r t i n e a c h s e n t e n c e w i t hou t c h a n g i n g i t s o r i g i n a l m e a n i n g . 4 . He was relentless in his pursuit of quality, so his technical skill was remarkable. A . p i t il e s s B . m e r c il e s s C . ru t h l e ss D . unr e l e n t i n g