To keep we should do more exercise and eat junk food.A. healthy; moreB. unhealthy; moreC.

问题补充：

To keep, we should do more exercise and eat junk food.

A. healthy; more

B. unhealthy; more

C. unhealthy; less

D. healthy; less

答案：

A. healthy; more

B. unhealthy; more

C. unhealthy; less

(答案→)D. healthy; less

解析：句意: 为了保持健康，我们应该多做锻炼并且少吃垃圾食品。keep healthy 保持健康，在这个短语中要注意使用形容词形式；less 更少；more 更多。根据句意可知选D。