1.   Extensive research has proved the theory wrong.

2.   Nevertheless, many agrochemical companies are undertaking extensive research programmes on biological control.

3.   Extensive research is being done into the connection between the disease and poor living conditions.

4.   The Population Council report found that while most countries have done extensive research on women as mothers, men as fathers have been virtually invisible to researchers.

5.   But by the sixties, after extensive research, the deadly disease was finally brought under control.

6.   With the New Year came the signing of a contract with Surrey Universityto carry out an extensive research project into management skills and knowledge in several EC member states.

7.   Despite extensive research, the mechanisms underlying between-individual variation in susceptibility to alcohol induced liver damage remain elusive.

8.   Whether it provides the basis for more general statements about the relative performance of SE and NSE students is difficult to tell without more extensive research.