Надо задать семь вопросов к предложению: they will dance in the hall tomorrow.(например: когда они будут танцевать в холле? но надо вопросы по

When will they dance in the hall?
Where will they dance tomorrow?
Who will dance in the hall tomorrow?
What will they do in the hall tomorrow?
Why will they dance in the hall tomorrow?
How long will they dance in the hall tomorrow?
Which dance will they dance in the hall tomorrow?