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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which
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what
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who
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whom
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You have won the first prize in the game, ______ you didn’t mention in your speech yesterday.
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as
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since
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There is a system ________the waste is disposed of using the principles of ecology.
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Although several months has gone by, Mary still has __________ memories of things and persons __________ she felt curious about at the wedding reception in Brunei.
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Jim passed the driving test , ________ surprised everybody in the office.
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