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Since 1949, the people’s living standard _______, causing a big _______ in population.

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A. watched    noticed    saw    recorded  
have taken place; was founded    has taken place; was founded    have been taken place; founded    took place; founded  
It    As    what    Which  
which   when   where   in which  
dates to   dated back   dated from    dates back to  
dates to    dated back    dated from    dates back to  
on which    in which    that    which  
which  when   that  where  
A.watched   noticed   saw   recorded  
was founded    was found    founded    is found  
founded  started  improved  built  
was found    founded    was founded    found  
supported  established  discovered  emerged  
after  before  when  since  
didn’t include  not included  not including  not to include  
founded  started  improved  built  
has been raised; rise    has been risen; raise    has raised; rise    has raised; rose  
that; that    that; when    in which, that    when, that  

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