chilampoon

They said that my application is still under review. So I assume that they are still sending out invites

For those who are concerned with Upenn, I just decided to email to ask if I got an interview.  I will update once I hear back. 

I just got out of jail and ate a fellow in mate alive while in there. Do I have to worry about getting in?! -.-

I'm not sure what you mean by sample paper. Apps can be edited up until you submit, so if, for instance, the app requires you to upload a document before proceeding to the next section, you can go back to previous sections after the fact. You can do a "dummy" application for a school you don't plan to apply to. People start apps and change their minds all the time. However, you're just adding more work for yourself. You can get the same results (tracking amount of time it takes to enter your name, address, etc) by just starting an application for a school of interest. Then, you can go back and upload the newer versions of documents such as SOPs and writing samples.
The bulk of the work in applications is really writing out your SOPs, any additional pieces of writing they may want, formatting your CV, and gathering supporting documents (GRE scores, transcripts, etc.). The actual application usually consists of filling out basic contact/demographic information and uploading appropriate documents. 

You can, but why not just start 1 application for a school you're interested in and see how much time it takes you to complete it? It seems like more work to fill out a whole application for a program you aren't even going to apply to. You don't have to do all applications in 1 shot. You can fill things out, close it out, come back to it later, etc.