The workers (build) a new block of flat in our region нужно отрицательная форма и 4 вопроса

The workers have built a new block of flat in our region.
The workers haven't built a new block of flat in our region.
Have the workers  built a new block of flat in our region? - общий 
Have the workers  built a new block of flat or houses in our region? - альтернативный
What have the workers  built  in our region? - специальный
The workers have built a new block of flat in our region, haven't they? - разделительный