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It's best to stay indoors,________when PM2.5 has reached dangerous levels.(  )

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to stay; to go    staying; to going    staying; to go    to stay; to going  
outdoor  outdoors  indoor  indoors  
to stay; to go    staying; to go    to stay; to going    staying; to going  
exactly    possibly    generally    especially  
outdoor    outdoors    indoor    indoors  
rains; rains    will rain; rains    rains; will rain    will rain; will rain  
so hot a day  so a hot day  such hot a day  such a hot weather  
less than two hundred years  more than a hundred years  less than a century  nearly a century  
Why don’t you stay at the library?    I’ve been looking forward to it for ages.    Get dressed and hurry to work.    Let’s make the most of it.  
to stay; to go    staying; to going    to stay; to going    staying; to go  
and, that    so, that    therefore, so    that, that  
and, that    so, that    therefore, so    that, that  
less than two hundred years  more than a hundred years  less than a century  nearly a century  

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