Complete the following sentence with a (compound) word derived from the one(s) given in bracket.
The animal moved with such （ ） that we didn’t see where it went. (rapid)
【正确答案】：RAPIDITY
【题目解析】：
根据前文such说明空格处应该填名词形式，rapid的名词形式为rapidity速度，迅速，且符合句意。句意：这只动物移动得如此之快，以至于我们看不清它去了哪里。。