Example sentences of "[verb] on [prep] a long period " in BNC.

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1 They went on over a long period and affected many children who had been entrusted to the defendants for care and help .
2 The arrival of Islam and the Arabic language was to mark another of the great turning points in the history of Egypt , and their absorption by Egyptian society went on over a long period , being generally a peaceful and incremental process .
3 Students often hesitate to let a rhythmic design run on for a long period , fearing monotony ; they therefore begin something different every few bars , sometimes in the belief that changing words need a constantly changing accompaniment .
4 In some programs files have to be inverted overnight and this requires the microcomputer to be switched on over a long period of time .
5 This is not wanted to there has to be a circuit arrangement which does not respond to a short pulse from the batting l.e.d. but acts only if this l.e.d. remains on for a longer period , that is , when the batsman has correctly intercepted the ball .
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