—You should the shower when you are washing your hair.—OK. I will. We need to save water.

问题补充：

—You should the shower when you are washing your hair.

—OK. I will. We need to save water.

A. put on

B. put off

C. turn off

D. turn on

答案：

A. put on

B. put off

(答案→)C. turn off

D. turn on

解析：考查点：动词短语辨析。解题思路：put on穿上；上演，put off推迟， turn off关上，turn on打开。根据语境：洗头发是应该把水关上。