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_______ UFO landed while I _________ last night.

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am watching TV    was watching TV    have watched TV    watched TV  
a ,the   the, an    a,an    an,an  
UFO’s are only recent observations  UFO sightings are not new  UFO’s are just comets, and auroras etc.  UFO’s are inventions by people who lack scientific knowledge  
what did you see    what you saw    when did you see it    when you saw  
Why  Where  While  Whenever  
A.,a  A.,an  An,a  An,an  
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that    while    when    because  
had walked  was walking  has walked  is walking  
An, the    A, the    A, a    An, a  
what did you see    what you saw    when did you see it    when you saw  
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