About Missing Exercises

While using Tobira Study Resources you may have noticed that most textbook exercises are not available. There are two reasons for this:

There is no answer key for the textbook problems, making it difficult to ensure answer quality.
I'm a student who is self-studying and I don't have a teacher/mentor to check my answers.

Because I want to ensure the quality and accuracy of the answers, I have decided to ommit these exercises for now. Fortunately, the workbooks make up for this by providing an answer key and offering a sufficient amount of exercises to practice grammar.