41.   She made an effort to change the subject of the conversation.

42.   Strenuous efforts have been made to program such recognition abilities into microcomputers and several packages for manipulating and comparing spectra are available.

43.   Teachers make great efforts to ensure that they do, even though the standards are demanding, particularly in maths.

44.   The council is making every effort to fill the vacancies.

45.   The country is making efforts to expand such economic sectors as tourism and information technology.

46.   The Forestry Commission are making valiant efforts to re-create these old woodlands, and are trying to preserve the little that remains.

47.   The government made strenuous efforts to upgrade the quality of the teaching profession.

48.   The job can be done by Friday if we all make an effort.

49.   The little boy made no effort to obey.

50.   The parole system has been making efforts to keep former convicts out of trouble.