---The 2010 World Expo (世博会) which will last 184 days will be held in Shanghai on May 1st. --- ________ exciting news! We shall try our best to support it.
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How
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What
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How an
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What an
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_______useful the dictionary you gave me last week is!
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How
B
What a
C
How a
D
What an
______ good news they told us yesterday! 
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How a
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How
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What
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What a
—________ hard work it is!—Yes, but he seems _____ to do it.
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What a , happy
B
What , happy
C
What a , happily
D
How , happy