71.   In some cultures, the stigma attached to AIDS is great and families try hard not to have the cause of death known.

72.   In some cultures, the stigma attached to AIDS is great and familties try hard not to have the cause of death known.

73.   Investigators said Wednesday they did not know the cause of the crash.

74.   Its cause is not known and symptoms include disturbances in vision, speech, balance, and coordination, as well as numbness and tremors.

75.   Its cause was not known.

76.   Its cause is not known and symptoms include problems with vision, speech, balance, and coordination, as well as numbness and tremors.

77.   Later he was seen walking away from the scene demanding to know the cause.

78.   Lee said investigators did not immediately know the cause of the crash.

79.   No storms were reported in recent days and the cause was not known.

80.   Police did not immediately know the cause of the accident that happened shortly after midday.