Though many of the heavy smokers have realized the serious effect that smoking has ______ their health, they continue to smoke instead of ______.

   A. for; giving it up    B. on; quitting        C. to; abandoning    D. on; leaving

Though many of the heavy smokers have realized the serious effect that smoking has ______ their health, they continue to smoke instead of ______.

1. A.
   for; giving it up
2. B.
   on; quitting
3. C.
   to; abandoning
4. D.
   on; leaving

Though many of the heavy smokers have realized the serious effect that smoking has ______ their health, they continue to smoke instead of ______.