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[A] What have they found [B] Is it true that laughing can make us healthier [C] So why do peo...

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whether  where  when  what  
How    What an    How a    What  
which    what    where    how  
think; have found  thought; had lost  saw; put  thought; had taken  
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within  scientists have  out what  is  
found    found out    got    looked for  
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which    where    how    what  
who’s that    what’s that    what if    can I help you?  
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