1.   AIDS remains a big problem in many parts of the world.

2.   Auditors some-times miss big potential problems that blow up in the face of bondholders.

3.   Both need to refocus the political debate from their respective ethics problems to the big problems facing the country.

4.   But for others, it persists and becomes a big problem.

5.   Car theft is a big problem.

6.   However, there is one big problem here, and that is that there is not a universal language for horses.

7.   If this election were about urgent crises, big problems, complex choices, the Democrat would walk it.

8.   Our big problem is our management system and old practices.

9.   Power supply is a big problem today, since battery technology has not progressed at the same rate as other information technologies.

10.   The big problem for anybody watching the opening ceremony must have been suppressing whoops of hysterical laughter.