11.   The Moon experienced only a brief period of intense internal activity early in its history.

12.   These mains spikes sometime consist of surges of thousands of volts, albeit for very brief periods.

13.   They come into existence after relatively brief periods of rapid change in a small sub-population of a pre-existing species.

14.   This letter detector remains active for some brief period of time, until the pattern mask is presented.

15.   ...the brief period in her life when she took Dexedrine as an appetite suppressant.

16.   Except for a brief period in August, rubber prices were in decline despite falling stocks and low output in Malaysia.

17.   In a BBC interview during his brief period of freedom he had promised to continue campaigning for multiparty democracy even if it meant a death sentence for sedition.

18.   He was a guy who could be something for a brief period of time and then he vanished like the spirit he was impersonating.

19.   He went through a brief period of chatting to the customers down at the bank about how he had seen someone come back from the dead.

20.   This brief period of anecdotal joviality over with, Sutherland goes back into serious actor mode.