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They've     some research     a the plant.A. did ;on B. done;atC. done;on D. did; at

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it is a kind of prearranged investigation.  no new knowledge can arise from applied research.  it is more difficult to get results in applied research.  no specific scientific ability is needed in applied research.  
am going to    can    will    should  
whether    if    which    that  
it is a kind of prearranged investigation.  no new knowledge can arise from applied research.  it is more difficult to get results in applied research.  no specific scientific ability is needed in applied research.  
that    where    which    in which  
am going to    can    will    should  
it is a kind of prearranged investigation.  no new knowledge can arise from applied research.  it is more difficult to get results in applied research.  no specific scientific ability is needed in applied research.  
it is a kind of prearranged investigation.  no new knowledge can arise from applied research.  it is more difficult to get results in applied research.  no specific scientific ability is needed in applied research.  
whether    weather    which    that  
ignore  leave  refuse  miss  
finished    enjoyed    suggested    practised  
to be; on    being; to    to be; in    being; into  
find out    look out    hand out    take out  
am going to    can    will    should  

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