11.   Pearls Of the two main sources of pearls those from Marine molluscs have always been preferred to those from freshwater.

12.   Should they be the main source of more specialist support and advice for community carers of all types?

13.   Since far fewer females than males commit crimes, this preoccupation has been one main source of sexism.

14.   The main source of work here is public sector employment.

15.   The rewards of motherhood made it her main source of self-esteem and satisfaction.

16.   The second main source of internal energy is heat from gravitational separation.

17.   The three main sources of short-term financing are trade credit, short-term commercial bank loans, and commercial paper.

18.   The Yahgans used canoes to hunt Marine creatures, their main source of food.