1.   The mystery remains unresolved as twilight turns to total blackness.

2.   And these particular mysteries remain outside the grasp of the United States because it seems to have no spies worth the name in North Korea, Iran or Iraq.

3.   But a huge mystery remains.

4.   But mysteries remained because the area in the lower bow damaged by the iceberg remained hidden under thick layers of mud.

5.   But mysteries remain.

6.   But more important mysteries remain about the former secretary general of the United Nations.

7.   But mysteries remained.

8.   But it does leave you feeling that their mystery remains unplumbed.

9.   But one mystery remains.

10.   But several mysteries remained.