题目内容：

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The police find most criminals because somebody tells them who the criminals are．They find other criminals by using science and their computers．When there is a bank robbery, the police first look t1.their computers for the names of the bank robbers that they know about．Then they go and talk to any of these robbers who are not in p2..They ask them where they were when the robbery happened．If any of these people cannot give a good a3., the police will often use science to find out if one of them is the robber.

Many criminals leave something of themselves at the places of the c4. like a fingerprint or a hair．Or they take something away on their s5.or clothes, like dirt or animal hair．If they leave behind some of their b6.or their hair or a piece of skin, it will have their DNA inside it.

Everyone’s DNA is different and their f7.are also different．So, if a criminal cuts himself during a robbery or leaves his hair, or e8.a small piece of skin, scientists can find out what his DNA is．The police can then ask the s9. to give them his hair or some blood and see w10. it has the same DNA．Many criminals are in prison today because of this kind of evidences .