Notes:
Restore the kingdom
This is a logical question. Jesus began his ministry with the appellation "repent for the kingdom of God is at hand" and here he is declaring his work as coming to an end. This must mean the kingdom is coming into being. With no other way of understanding a kingdom these people are expecting it to come as it always had - with power over the land and the political system. Established borders and law and order. They did not conceive of the kingdom Jesus inaugurated by completing his work and sending the Holy Spirit.