The obvious sign of his ______ is that he keeps glancing at his

The obvious sign of his ______ is that he keeps glancing at his watch.（nervous）
【正确答案】：nerve
【题目解析】：his意为”他的“，是形容词性物主代词，其后要接名词；nervous意为”紧张的“，是形容词，其名词为nerve紧张。