[iPad] App for word, excell and PDF

 

What is a good app to open Word, Excell and PDF.  I have docstogo on my iphone that works very well.  I downloaded something similar to the ipad.  I can open easily but it's miserable to try and close the document.  I have to keep tapping until finally a 'Done' box opens in the upper left corner. 
 
Chris

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