填空题

She didn't know who had sent the letter, and the envelope proveded no（）．
她不知道是谁写的信，信封上没有任何线索。

答案： clue

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After the robbery，the police arrived at the scene of the （） to take the statements from the victim and the witness．
抢劫案发生后，警察赶到现场从受害人和目击者那里取证。

答案： incident

The police have had to drop charge against him because they couldn't find any （）．
警察不得不撤回对他的指控，因为他们找不到任何证据。

答案： evidence