Not Dutch!
I saw this movie a few days ago, and I enjoyed it very much. But what really annoyed me was that the "Dutch" girls were nowhere near being Dutch! The girl who slept with one of the boys (I can't remember who) said "Jeg vil også savne dig!" (Danish for "I'll miss you too!"), and that is not even close to being Dutch! You can also see in the credits that the actresses have Danish names, and the teacher (I think) was born in Copenhagen and has been in several Danish movies.
Why didn't they use Dutch people?