Dad, I think you should stop _____. It's bad for your health. [ ]

A. smoke

B. smoked

C. smoking

D. to smoke

你注意到浇花用的洒水壶有两个把手吗？如下图所示，当用洒水壶提水时，应该用_______ 把手；当用洒水壶浇花时，应该用_______ 把手，这说明_________________ 。