New Words：

clue [klu:] n. 线索, 提示
not have a clue 毫无头绪， 什么也不知道

Sample Sentences：

I'm sorry, I haven't a clue.
The police are busy hunting for clues.
There is no clue to the identity of the thief.
"Do you know the time of the next train? " "I don't have a clue."

identity [aɪˈdentəti] n.身份；同一性；一致；特征
identity card 身份证

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