Ⅰ.单项选择。从A、B、C、D四个选项中选出填入句中空格的最佳答案。（20分）
( ) 1. Swimming is a good way to ____ .
A. keep health B. keep healthy C. keeping health D. keeping healthy
( ) 2. Well, if you take this medicine ____, you’ll be better soon.
A. third time one day B. three times a day
C. third time a day D. three times every day
