A : Welcome to the Zhoukoudian caves here in China. It is 61._____ great pleasure to meet you students from England , who are interested in archaeology. You must be aware that it’s here 62._____ we found evidence of some of the earliest people who lived in this part of the world. We’ve been excavating here for many years and... S1 : I’m sorry 63._____ (interrupt) you but how could they live here? There are only rocks and trees. A : Good questions. You are an acute 64._____(observe).We have found human and animal bones in those caves higher up the hill as well as tools and other objects. So we think it is 65._____ (reason) to assume they lived in these caves , regardless of the cold. S2 : How did they keep warm? They couldn’t have mats , blankets or quilts like we do. It must have been very uncomfortable. A : We’ve discovered fireplaces in the center of the caves 66._____ they made fires. That would have kept them warm , cooked the food and scared wild beasts away as well. We have been excavating layers of ash almost six meters thick , which 67._____(suggest) that they might have kept the fire burning all winter. We haven’t found any doors but we think they might have 68._____(hang) animal skins at the cave mouth to keep out the cold 69._____ the freezing winter. S3 : 70._____ wild animals were there all that time ago? A : Well , we’ve been finding the bones of tigers and bears in the caves , and we think these were their most dangerous enemies. Now what do you think this tells us about the life of these early people?