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While __________ for the bus, I happened to come across my childhood friend, Tom.

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while   unless   when   until  
when    while    .until    if  
While was waiting   While I waiting   While I am waiting   While waiting  
talk    talked    was talking    am talking  
a; the    不填; the    the; a    不填; a  
Because   Until   Although   While  
when    while    .until    if  
when   as   before   while  
when    since    while    until  
though    while    until    because  
while  unless  when  until  
It was while    As soon as    While    During the time when  
while    as    since    before  
though    while    until    because  
Passengers  are warned  get off  moving  
while   unless   when   until  
when    as    before    while  

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