31.   Who would have predicted that the Soviet Union would have disappeared within a decade?

32.   Without protection, environmentalists say, the species could disappear within a decade.

33.   At rates like that and nobody working, hard-currency savings disappeared within months.

34.   His heart heavy, Chris Patten, suddenly a politician without portfolio, finished his crisp walk onto Britannia and disappeared within.

35.   Normally, this condition disappears within the first year.

36.   Released from the pressure of the deep, the ice disappears within minutes.

37.   Researchers found that the procedure partially corrected an abnormality in electrical charge that is seen in tissue from cystic fibrosis patients, but the effect disappeared within a week.

38.   She said a sequence of photos shows dramatic changes in cloud cover, with bright swirls appearing and disappearing within just a matter of weeks.

39.   The exhaust turned blue as it fell, and the clouds disappeared within about an hour.

40.   The symptoms disappeared within a week.