The system is very sensitive to spelling and punctuation. We, at OLT, are not sure why the system responds this way. Fortunately the lesson questions do not count toward your grade. They are only for practice.

Therefore, if you understand the question and know the answer, you should continue to the next page - even when the system 'marks' the answer as incorrect.

If you are unable to answer the question, you should go back and re-study the material that was on that page.