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How many possible causes of sleeplessness are mentioned in the second paragraph?

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Five.  Six.  Seven.  Numerous.  
possible   it possible   that possible  it is possible  
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Cures for cancer will soon be found if we know how cancer cells arise.  We’ 11 have to wait fifty or sixty years before we understand the Causes of cancer.  Even when we understand the causes of cancer, that doesn’t mean we will soon find a cure for cancer.  We won’t understand the causes of cancer before the end of the decad  
as much as I can      as possible as I can        as many as possible      as many as I can