21.   In its place we shall have the serious problem of gearing for London.

22.   Is there a serious practical problem that Congress needs to address?

23.   It was realized very early on that interactions involving isotropic stellar winds had serious inherent problems involving energy.

24.   Key events included radical job changes and serious problems, as well as lucky breaks.

25.   Lifting things carelessly can lead to serious back problems.

26.   Loneliness and Boredom Perhaps the most serious problem of all was simply that there was not enough adventure or diversion.

27.   Many women have serious problems and deserve to be treated with respect and offered help that is to the point.

28.   On a practical point, finally, the crisis raised a serious problem.

29.   Our serious problems have been caused by the deals that have been negotiated by the Government.