21.   The contents of the talks have been kept secret by both sides for fear of derailing them and have shown no sign of a breakthrough.

22.   The confidence-building talks have been kept secret by both sides and have shown no sign of a major breakthrough.

23.   The confidence-building talks have been kept secret by both sides.

24.   The fines were kept secret by Australian authorities until last month.

25.   The fines were kept secret by the ACB, a move criticized by its own bribery inquiry on Wednesday.

26.   The location of the valley has been kept secret by the state government to protect the discovery.

27.   The identities of other politicians has been kept secret by the central bank in line with privacy regulations.

28.   The record find had been kept secret by authorities who feared publicity would hinder follow-up investigations, the reports said.

29.   The Soviet Union was notorious for environmental pollution, most of it kept secret by the government.

30.   Those talks, kept mostly secret by the host South Africans, were believed to have stalled and both envoys returned home.