11.   These people rarely volunteer for investigation in controlled EEG studies.

12.   They caused no injuries but sparked the in-depth investigation in late February, which was extended for an additional four months.

13.   This number sequence is frequently used in mathematical investigations in ordinary schools.

14.   Surprising developments have kept the murder investigation in the headlines for several weeks.

15.   All were believed to have belonged to the secret Civil Co-operation Bureau, whose activities were currently under investigation in South Africa.

16.   The Senate Ethics Committee opened investigation in November into the conduct of five of its members involved with Keating, the head of a failed thrift.

17.   Plain radiography, with its superior spatial resolution, remains a key investigation in the initial diagnosis of a primary bone tumour.

18.   This survey also allowed us to analyse the usefulness of investigations in iron deficiency anaemia in outpatients.

19.   Further investigation in other clinics were negative except for ultrasound scanning which revealed gall stones in three and they had a cholecystectomy.