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It will be many years ______the doctors and medical scientists can find _____ for cancer.

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didn't you see    haven't you seen    hadn't you seen    don't you see  
didn’t you see  haven’t you seen   hadn’t you seen  don’t you see  
it was when    it was that    was it when    was it that  
to meet; hadn’t seen    meeting; haven’t seen    to meet; haven’t seen    meeting; hadn’t seen  
had you seen    you had seen    hadn’t you seen    you hadn’t seen  
regularly  constantly   occasionally  frequently  
it was when    it was that    was it when    was it that  
regretted    knew    realized    recognized  
has    hasn’t    is    isn’t  
know    know about    recognize    find out  
mustn’t she  can’t she  is she  isn’t she  
it was that  was it that  it was when  was it when  
didn’t you see   haven’t you seen   hadn’t you seen   don’t you see  
many years that    many years before    many years ago that    many years when  
didn't you see    haven't you seen    don't you see    hadn't you seen  
it was when    was it when    was it that    it was that  
didn’t work   wasn’t working   doesn’t work   isn’t working  
didn’t you see   haven’t you seen   hadn’t you seen   don’t you see  
too much , too many   too many , too much   t  
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