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The teacher is busy ____ teaching. A.with B.for C.on ...

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that time    by which time    by that time    which time  
waiter    reporter    teacher    nurse  
to do  to   doing  doing it  
nice    late    busy    easy  
for   in   on   of  
that time    by which time    by that time    which time  
prepare    preparing for    to prepare for    preparing  
to; drawing    at; draw    at; drawing    at; to draw  
waiter  reporter  teacher  nurse  
with   for   on   of  
What    Why    How    Who  
leaves out   squeezes out   picks out   points out  
to write out; answering  to write out; to answer  writing out; to answer  writing out; answering  

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