libreoffice can not be removed completely

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http://askubuntu.com – I am using ubuntu12.04 and the xfce4.6. Now I remove the libreoffice through the Ubuntu Software Center,however it seems that it is not removed completely. Since I can find the libreoffice item at the menu Application-Office-LIbreOffice,also I can run the libreoffice command in the terminal. Both of them can start up the libreoffice,however this is the screenshot: As you can see, the Text Document Drawing and etc are not available. What is the problem? (HowTos)