31.   Just one letter from Tyndale survives from his long period in prison.

32.   Many of their colleagues are off work sick for long periods being treated for nervous disorders.

33.   Ni-cads, by the way, should not be left in a discharged state for very long periods.

34.   Other types of skin cancer are associated with continued exposure to the sun over a long period.

35.   Over a long period, however, the continued leaks could accelerate the rate of deterioration of the concrete.

36.   Patients allege that the two firms failed to warn doctors about the dangers of taking the drugs over a long period.

37.   Perhaps the attitude developed during a long period of established practice and little change.

38.   Political parties retain the same name over long periods, implying sameness of identity.

39.   Prussia, like Britain, had a relatively long period of effective, legitimate government before the introduction of democratic institutions.