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It will be many years before the doctors and medical scientists can find   (治愈)for cancer.

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since; cures    when; treatments    before; cures    until; treatments  
that; an    when; a    until; \    before; \  
when   for   before   until  
before    after    when    that  
before  after  since  when  
since; cures    when; treatments    before; cures    until; treaments  
They have a well-paid job.  They don’t want to have children.  They have their children at a much older age.  They have no time to look after their children.  
the size of the workforce is becoming larger  the population of the UK has been on the rise  the workers of the UK are much younger than before  the average number of children in British family is falling  
very   greatly   many   never  
when    after    before    until  
when    before    that    since  
as if    even if    because    after  
should have at least two children  have to be more than 30 years old  should have been married for years  need a few years of work experience  
when    for    before    until  
many years that    many years before    many years ago that    many years when  
since; cures    when; treatments    before; cures    until; treatments  
after        since        before          until  
practise play  practising playing   practicing playing the   to practice playing.  
before  after  since  when  

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