. It never occurred to humans until the mid-l990s _______some animals can be cloned.
_____you I owe a thousand apologies____ having doubted your ability.
______at in this way, the present situation about birds flue doesn’t seem so disappointing.
______, I think, and all the problems could be settled.
The TV programme has______on the children as______as the old.
It was________great shock to the world that two aero-planes crashed into______World Trade Center in New York o September 11th, 2001.