The room was completely dark and I fumbled________ for the door.

The room was completely dark and I fumbled________ for the door. （blind）
【正确答案】：blindly
【题目解析】：原句的意思是“房间漆黑一片，我盲目地摸索着找房门。”因此这里需要填的是个副词，我们填blindly。