Example sentences of "[noun] have been a [adj] source " in BNC.

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1 The annual reports of the Law Society , and the comments and advice of the Lord Chancellor 's Advisory Committee on Legal Aid have been a valuable source of information and of recommendations for changes in policy ( whether accepted or not ) .
2 From the start , chapels have been a constant source of concern to SAVE , and Northern chapel architecture was the subject of a special SAVE exhibition and report , The Fall of Zion .
3 The results of assessments and examinations have been a valuable source of feedback to enable teachers to evaluate their teaching material , curriculum , presentation and so on .
4 Neither the researches funded by charities specifically directed towards cancer nor the great drives sponsored by governments and planned by committees have been a fruitful source of new treatments .
5 Novels have been a rich source of material for the film industry since the talkies were introduced , and it 's very interesting to see how both classic and contemporary novels require skilled adaptation of the dialogue to make sufficient dramatic impact in a film .
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