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They ______ the train until it disappeared in the distancE.  

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when   before   since   that  
saw    noticed    observed    watched  
scene  sight  glimpse  reach  
is running    will be running    will have run    has run  
until    unless    though    because  
must    have to    stop    live  
by    in    for    until  
if  unless  though  until  
was until; that    wasn’t until; that    was until; when    wasn’t until; when  
saw    watched    noticed    observed  
went  is going  goes  will be going  
waved   to wave   waving   and waved  
before    until    as    since  
couldn’t see  look  lose  can’t see  
saw  watched  noticed  realized  
was until, when    was until, that    wasn’t until, when    wasn’t until, that  
unless    as    if    until  

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