1.   Dance and aerobics classes are a useful tool for encouraging girls back to school P.E. lessons.

2.   The Internet is a useful tool for investors.

3.   The Internet is becoming a useful tool for investors.

4.   Once a useful tool, slide rules have fallen into obsolescence.

5.   The determination of the internal opportunity cost can be a very useful tool in the decision making and the planning process of an organisation.

6.   The computer or concept keyboard is becoming a useful tool in the preparation work for site visits.

7.   Alonzo sees DV more prosaically, as just another useful tool.

8.   Among the more useful tools are the sites being set up by arts institutions.

9.   Among the more useful tools are the sites being set up by arts institutions.By L.R. Shannon.

10.   And abstinence and fasting can be useful tools to focus the spiritual life.