Students should get a good habit of studying you can’t do any other things while you’re d

问题补充：

Students should get a good habit of studying, you can’t do any other things while you’re doing homework. So please your MP4.

A. turn on

B. turn up

C. turn off

D. turn down

答案：

A. turn on

B. turn up

(答案→)C. turn off

D. turn down

解析：根据前文的内容you can’t do any other things while you’re doing homework，可知，关上MP4，故选C