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On several occasions over the past decade, a heavy cloud of air pollution has covered the east of th...

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situations  environments  occasions  positions  
came to  came into  came over  came across  
what    which    when    that  
over; for    for; with    in; of    during; about  
is raised    was raised    will be raised   has been raised  
improved  developed  involved  survived  
millions    millions of    several million of    several millions  
over    across    along    between  
when    which    why    that  
what    where    which    why  
knocking about    knocking down    knocking over    knocking off  
applied    stuck    adjusted    took  
The  more than  destroying  over  
circumstances    situations    conditions    occasions  
improved  developed  involved  survived  
rejected   resisted   relied   reacted  
over    across    along    between  

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