Here's a good "how-to" for getting rid of the blah-language from your resume. As you describe your tasks and responsibilities--it all seems so ordinary, unremarkable. After all, it's what you did on a daily basis, and you were so familiar with it, you could have done it in your sleep.
I'm not advocating puffery--inflating routine stuff. Sorting mail, for example, does not bring about world peace, end global warming, or even slay dragons.
But take a look at what this writer does with "sorting mail." Quantify what you did. Give a sense of the scope, the size, the texture, the granularity of your work.