11.   There was a time when it was considered impossible to get it done at Stanford.

12.   Unbelievably, he did much of what he promised and what some considered impossible -- he combined the economic shrewdness of conservatism with the social passion of liberalism.

13.   Your DVD player is such a miracle it was literally considered impossible a decade before it was introduced.

14.   But an attack, especially using conventional warheads, is not considered impossible.

15.   Negotiating trade agreements is considered nearly impossible without fast track authority.

16.   Cloning an adult animal was previously considered impossible because of the complexity of the organism compared with an embryo.

17.   There had been predictions that inflation and growth would both be four percent next year -- something now considered impossible.

18.   While US scientists have cloned mice and tadpoles from embryos, it was previously considered impossible to clone an adult animal because of the complexity of the organism.

19.   Such a summit is considered impossible amid the current disputes.