261.Statistical evidence lends support to the view that a massive influx of funding is needed to strengthen crime prevention programs.
262.Personal experience has taught that kindness to others pays untold dividends.
263.Case histories show that all nations face recurring periods of economic fluctuations.
264.Personal experience leads me to conclude that all people need to take time to smell the roses （evaluate and appreciate the many good things they have in their lives).
265.Recent studies conducted by doctors show that excessive exposure to the sun''s rays causes skin cancer.
266.Nationwide surveys conducted in 1997 revealed a dramatic rise in the ownership of television sets, refrigerators, air conditioners and washing machines.
267.History tells us that mankind has a tendency to repeat past mistakes.
268.We have amassed ample objective proof to show the urgent need for crisis intervention in suspected child abuse cases.
269.Unfortunately, available evidence fails to establish any direct link between smoking and cancer.
270.Fortunately, mountains of reliable evidence proves the direct link between smoking and cancer beyond any shadow of the doubt.
271.Television violence has contributed directly to rising crime, as evidenced by statistics showing a dramatic rise in copycat crimes.
272.The introduction of adcance agronomic techniques has contributed greatly to the development of agriculture, as indicated by statistics showing increased output in each of the past five years.
273.While it may appear that the gap between rich and poor people is narrowing somewhat, recently released evidence suggests that the opposite is true.
274.While attaining world peace remains within the realm of possibility, the prevailing trend revolves around regional conflicts and internal strife in many countries.
275.Although statistics are quite often far less reliable than one might wish, other reliable information allows one to closely approximate industrial output figures.
276.Although random sampling used for many surveys fails to cover large segments of the population, the procedure nonetheless offers insight into voting and consumption patterns.
277.The need for more government services has proved to be the case time and again.
278.The funny thing about marriage is that the newness soon wears off.
279.There are instances when one must abandon the tendency for self-prevention in order to assist a person in grave danger.
280.There are situations in which it's highly advisable for a person to control his/her temper and keep his/her mouth shut.