41.   Exam results are used as performance indicators for schools.

42.   Extracts from the croton have been used as fish poisons.

43.   Fish oil has been used as a folk remedy since the eighteenth century.

44.   For many years ferrous sulphate was used as a supplement.

45.   For the time being, this single track was to be used as a terminus for the service.

46.   For, as before, the credit instruments soon became used as means of exchange.

47.   For, if he used her as a model, she used him as good copy.

48.   Further up the village is the old school, which is now used as the village hall.

49.   Furthermore, its integration with other desktop applications allows it to be used as a powerful document transmission system.

50.   Gender should never be used as a bottom line explanation because it is a social construction needing explanation itself.