In the given passage there are blanks, each of which has been numbered. Against every four words are suggested, one of which fits in the blank appropriately. Find out the appropriate words in each case.

Scientists have discovered the world´s oldest known animal cave art _(1)____ the Indonesian island of Sulawesi. The painting of a wild pig has been dated to 45,500 years, and scientists consider it the __(2)___ depiction of the animal world anywhere on the planet. The animal has a clearly visible head, tail, and legs and next to it, there are two images of human hands. The __(3)___ of the discovery was really special and incredibly ___(4)__ because it was located in a hidden valley up in the highlands of southern Sulawesi. It was really close to one of the largest cities ___(5)___ Indonesia. Scientists said that they were extraordinarily lucky to be able to date the painting based on the discovery of a small mineral growth that had formed on top of the painting. The dating method which was used is called Uranium-series dating.