Itisestimatedthat，currently,about50，000speciesbecome_____everyyear．
A、extinctThedestructionofthetwintowers_________shockandangerthroughouttheworld．
Tomplacedthebanknotes，_________thechangeandreceipts，backinthedrawer．
TheinteractionsbetweenChinaandtheUSwillsurelyhaveasignificant_______on.peaceandstabilityintheAsia.—Pacificregionandtheworldasawhole.
Thepoorcountriesareextremely_______tointernationaleconomicfluctuations
In1991，whilet11eeconomiesofindustrializedcountriesmetaneconomic_____，theeconomiesofdevelopingcountriesweregrowingveryfast．
