This sums up what I feel about this course. ^^;
The most natural translation of this is something more like "well i have no idea"
What's wrong with my answer 'I really don't know'?
"Well, I have no idea" should be a validade answer.
Finally, something I can use every day.
"Well, I totally don't know" wasn't accepted.
It's not wrong, but it's a bit slangy. It's tough for a course to accept all things of that sort...
"Well, I really don't know" is a perfectly normal construct and ins't accepted either
"beats the heck out of me" wasn't accepted either! fnord