Поставить вопросы ОбщиеСпециальные Или альтернативныеНудно более 10His sisters work at a

Do his sisters work at the new factory?
Who works at the new factory?
Where do his sisters work?
Whose sisters work at the new factory?
What do his sisters do at the new factory?
Do his sisters work at the new factory or at the post office?
His sisters work at the factory, don't they?