【题目】English has a large (词汇) with different usage so it's not easy for a Chinese person to speak English as (流利地) as a native English speaker.
在线课程【答案】vocabulary；fluently
【解析】vocabulary；fluently；考查名词和副词。前一空根据汉语提示可知填vocabulary，后一空根据汉语意思以及此处是来修饰动词speak，应用副词，故填fluently。