To rank your article for specific keyword and you don't Chimp Rewriter to rewrite these keyword, then you would want to protect these keyword.

Click Projects -> Protected Term

Click New to Add one protected keyword term at a time

Click Load to load a file of project keyword terms

Create (protected keyword term.txt) text file using Notepad

1) Click Window Start -> Go to Search

2) Type notepad

3) Open notepad

4) enter list of keywords (one keyword per line)

5) save the file  (protected keyword term.txt) 

6) Click Load from Step above

7) pick the  (protected keyword term.txt)  file