21.   The excess fuel cools the engine - acceptable for short periods in the climb but inefficient and expensive for extended cruise.

22.   The Government warned that it would apply only for a short period.

23.   The idea would be to compile over a short period a national register of wealth holdings.

24.   The learner is allocated to the ward for such a short period that every learning opportunity must be exploited to the full.

25.   The mass media, particularly the national mass media, pursue stories with great intensity for short periods only.

26.   Then, within a short period, his mother, father, and brother all died.

27.   These have short periods, from a few days to a few weeks.

28.   This usually covers a short period to assist the applicant in defining a work programme.

29.   Yet even here annual plants prevail to grow and during the short dry period produce seeds.

30.   You will therefore be put in the position of paying two mortgages at the same time for a short period.