I ______(read) that there are secret meeting rooms somewhere in the building. many scholars thought that the rooms _______(build) to decide complicated issues of the country. We _______(look) for them for quite some time in the near future. However, the mystery_________(realize) by the historians in the future. Therefore,we _______(need) to conduct many Investigations to have some vivid conclusion in the secrecy of the hidden rooms of the building.​