_______, it is obvious that the whole thing was a waste of time and effort.

There are ten mistakes in the following passage. Find and correct them.  

      It seems that the mystery of why the Pyramids were built may have solved. Until quite recently people got used to think that they were just tombs for pharaohs. Instead, the connection with astronomy seems much more important. Egyptologists have often asked them how long it spent to build them and why people built them in first place. Experts came up with a suggestion that the Egyptians may have believed in the River Nile was the earthly equivalent of the Milky Way. Many agree that the sizes of the three Giza Pyramids are in promotion to the three stars of Orion. Nothing, then, was by the chance. Rather, the souls of dead pharaohs were deliberately being project through shafts to reach at their goal of the Orion constellation.