Complete the following sentence with a (compound) word derived from the one(s) given in bracket.
It has been estimated that about five thousand people in Britain walk the whole （ ） of the Pennine Way every year.(long)
【正确答案】：LENGTH
【题目解析】：
根据前文whole为形容词，形容词修饰名词，所以这里应该填名词的形式，long的名词为length长度。句意：据估计，英国每年大约有5000人沿着整条平宁步道散步。