http://people.colgate.edu/dhoffmann/text/Ex200_Folder/Ex139_wclz.htm
http://people.colgate.edu/dhoffmann/text/Ex200_Folder/Ex150_wqz.htm
http://people.colgate.edu/dhoffmann/text/Ex200_Folder/E171wqz.htm
http://interdeutsch.de/Uebungen/zuordn.htm
http://www.nthuleen.com/teach/grammar/verbpraeps.html
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