1.   The first systematic studies of political parties belong to the end of the nineteenth century.

2.   The first systematic study of intergroup competition was made about twenty years ago by Sherif and colleagues in the United States.

3.   The systematic study of this dependence has recently been made feasible by the development of the theory of sequential games.

4.   She made a systematic study of the evidence.

5.   A systematic study revealed that many modern languages descended from a commonparent language, lost to us because nothing was written down.

6.   There has been no systematic study, however, to discover if this assumption is correct.

7.   The next chapter reports a more systematic study of these effects.

8.   There is plenty of evidence of Caribbean influence on the speech of London adolescents, though there has been little systematic study in this area.