You mustn't listen to music in class改为祈使句：（ ）（ ）music in class

You mustn't listen to music in class改为祈使句：（ ）（ ）music in class
You mustn't listen to music in class
改为祈使句：（ ）（ ）music in class

You mustn't listen to music in class改为祈使句：（ ）（ ）music in class
Don't listen to

Dont listen to music in class.

Don't listen music in class

Don't listen to music in class

Don't listen to

No more 两个空的填法并不多啊，我觉得这个还算合适。