Extensive work has been done to the schools since 2001.

He had probably already decided to write a more extensive work.

Extensive work was still done over the next nine years.

Extensive work has been put in at all levels and across a wide range of areas.

The organization has also done extensive work on child soldiers.

This is really the fourth book of a more extensive work.

He has done extensive work in the literary field also.

Extensive work on a large room could cost in the $20,000 range (including materials).

In 1997 extensive work was done on the church's exterior.

During the 1990s there was extensive work done on the tower.