语篇语法填空。阅读下面材料，在空白处填入适当的内容（不多于3个单词）或括号内单词的正确形式。
A: Welcome to the Zhoukoudian caves here in China. It is (1) _______ great pleasure to meet you students from England, who are interested in archaeology. You must be aware that it’s here (2) _________ 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 …
