21.   Five inmates working in a furniture factory died after they drank a poisonous substance they thought was liquor, the prison director said Tuesday.

22.   Five inmates working in a Romanian furniture factory died after they drank a poisonous substance they thought was liquor, the prison director said Tuesday.

23.   Fish that have digested toxins usually show no sign of having consumed the poisonous substances that cannot be eliminated by cooking.

24.   In addition, hundreds of people die each year in Russia after drinking concoctions passed off as alcohol, but which contain poisonous substances.

25.   In mid-May, Derosena examined the kidneys of dead children and formulated the hypothesis that a poisonous substance had killed them.

26.   Methanol is a poisonous substance normally used as an antifreeze.

27.   NASA insisted all along, however, that the launch would be safe because of the numerous precautions taken with the poisonous substance, shielded several times over.

28.   Overfishing and the use of poisonous substances are also destroying marine organisms in many ocean areas worldwide.

29.   Some villagers gathered up the poisonous substance.

30.   She found them sitting in the school bathroom just moments after they had consumed the poisonous substance.