past perfect vs past perfect continuous

When we came back home, the children ___ for two hours.

Claire said she ___ her sister since last month.

The film ___ when we came to the cinema.

I was extremely unhappy to have lost my watch. I ___ it for a very long time.

Mike said they ___ at the airport for two days because of the delay of their flight.

When I arrived, Lucy ___ in bed with temperature since lunchtime.