An unsolved question in Bonn, officials said, is how quickly the reactors should be phased out.

There should be a third way, which might, during an interim process, solve most unsolved questions.

"There are more unsolved questions than that in the realm," she said, "and nearly all, I think, more important."

There was an unsolved question that had to be answered first.

Then, as the story unfolds, a number of mysterious, unsolved questions keep emerging, along with two more murders and a suicide.

The size of the Russian army remains an unsolved question.

Monk is left with one unsolved question - how did the killer get in or out of the restaurant without being seen?

At the same time, I can guarantee that some of the unsolved questions are very important indeed.

One of the most important unsolved questions here is the extent to which changes in ideas and attitudes are really autonomous.