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—Look! The lights in the teachers’ office are still on. Is Mr. Li working?—No. It _______ be Mr. Li....

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pick up    look at    turn on    play with  
if    unless    although    Because  
if    unless    although    because  
the lights were directly related to some basic "drives"  the sight of the lights was interesting  they need not turn back to watch the lights  they succeeded in "switching on" the lights  
if  unless  although  because  
look for  turn out  make sure  save up  
turning them off    turn them off    to turn them off    having turned them off  
if    unless    although    because  
look after  teach  depend on  enjoy  
although   if   unless   becausE.  
blue   yellow   red   green  

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