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For more than twenty years scientists have been seeking to understand the mystery of the ‘‘sixth s...

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what    which    that    where  
That’s to say   What’s more   Believe it or not   In other words  
ten years ago  twenty years ago  more than twenty years ago  less than ten year ago  
what    which    that    where  
more than; since    more than; in    for; in    for; since  
Living       Lived        Having lived     To live  
married    had married    got married    been married  
has worked  worked  is working  will worked  
to be living  to have lived  to have been lived  to live  
gainfully employed  upwardly mobile  excessively overweight  privately educated  
more than twenty    another twenty    the other twenty    less than twenty  
So is his mother    So has his mother    So his mother does    So it is with his mother  
got married; were married    married; married   been married; got married    got married; got married  
works    was working    has worked    will work  
to be living    to have lived    to have been lived    to live  
is  joined  has joined  has been in  
That’s to say    What’s more    Believe it or not    In other words  
has;joined  did;join  has;been in  does;join  
ten years ago  twenty years ago  more than twenty years ago  thousands of years ago  
has left    would have left    had left    left  

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