Present perfect vs. present pefect continuous

Here can find some exercises on present perfect and present perfect continuous.  The key to the exercises is also hereby made available.

Short reading list following Elsa's presentation

- Guns, Germs, and Steel: The Fates of Human Societies by Jared M. Diamond
- Our Posthuman Future by Francis Fukuyama
- The History of the Human Body by Daniel Lieberman
- The Better Angels of Our Nature: Why Violence Has Declined by Steven Pinker