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1. Complete each sentence by filling in the blank with the best word from the list. Use each word only once.

1. Officials could not   Basil because people in villages and towns throughout the country were willing to hide him.
2. During their   of O′Brien′s house, detectives audiotaped his phone conversations.
3. Until we finish our   into the disappearance of the cash, all employees are suspects.
4. Even if there is  , such as fingerprints, that might   someone in a crime, there might be other indications that the person is innocent.