Which of the adjectives in B in the vocabulary section might you use to describe:

1. a pupil who deliberately makes it hard for his teacher to continue with the lesson
2. an accident which affects the victim psychologically
3. a book that deals with very difficult ideas without simplifying them
4. a child who is very disobedient and self-willed
5. pain that is almost impossible to put up with
6. a speech that is very difficult to follow because the line of argument is very complex
7. an exhausting Arctic expedition
8. a decision that is not easy to make