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The Nuclear Security Summit is an initiative of Mr. Obama,       considers nuclear terrorism to be one of the greatest threats to international security.
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It is in that primary school ________ Mary once studied for six years that she will build a library，________ delights all the students and teachers in the school.
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that；that
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The book tells stories of the earthquake through the eyes of those ________ lives were affected.                                                                
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The worker_______left leg was broken was sent to hospital at once.
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I will never forget the classmates ______ I studied with.
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I have bought the same computer       she is using. 
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