1.   He still faced the thorny problem of finding a way out of the Jungle.

2.   Intellectualproperty issues are another thorny problem.

3.   It was left to us alcoholics to sort out the thorny problem.

4.   None of these struck me as particularly penetrating answers to a thorny problem.

5.   The ongoing success of his department validated his approach to the thorny problem of appraising individual effectiveness.

6.   The third text, c, offers more thorny problems.

7.   Witchcraft thus disposes of the thorny problem of the existence of evil.

8.   With the emergence of a global community, however, thorny problems appear.

9.   Members, the retention of membership is a very thorny problem.

10.   One of the issues that faces teachers wanting to use drama in the teaching of history is the thorny problem of facts and authenticity.