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The professor made a contribution to   (develop) his students'listening and speaking skills.

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to improve    to improving    improved    to be improved  
at which the results  the results on which  of whose results  whose results  
having made    making    to have made    to make  
referring to; was made    referring to; be made    referred to; be made    referred to; was made  
achievement    acquaintance    recognition    association  
to build  building  build  built  
commonly    comparatively    effectively    separately  
passed on  handed in  fished out  made out  
having made  making   to have made  to make  
where  which  that  when  
referring to  referring  referred to  referred  
building  to build  build  being built  
building  to build   build  being build  
which; as    as;that    that;which    as;which  
was opposed to carry    opposed to carry    objected to carrying    opposed to carrying  
acquaintance  association   recognition  acknowledgement  
passed on  fished  handed in  made out  
to make  to have made  having being made  having made  
expecting    is expecting    expected    to have expected  

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