阅读下面材料，在空白处填入适当的内容（1个单词）或括号内单词的正确形式。

    Ten Chinese engineers were driving down a road to a NationalForest Park.

    They were____(sudden) amazed by what they saw. Three tall animals,____(cover) with long black hair, werecrossing the road. On ____(see) the animals, the engineers immediately stopped and ran after them. However, when they saw ____move through the forest with great speed and strength, they did not dare to follow any ____(far).

    The men did not take any photographs but scientists were delighted by the ____(discover), because the engineers are all well educated people and scientists feel they canrely on what they ____(describe).

    Scientists returned to the forest, collected some hair and measured footprints, ____are about 20 inches. They appear to be the animals' feet! Chinese scientist have now set upa special group to exchange information and made a study of the forest. But inthe meantime, some people refuse to believe that this half-man, half-monkey ____(exist). They will not believe it ____oneof the animals have been caught.