Itisestimatedthat，currently,about50，000speciesbecome_____everyyear．
A、extinctThemanageriscallingona______customertryingtotalkhimintosigningthecontract．
Idon’tthinkyou'llchangehismind；oncehe’sdecidedonsosomethinghetendsto_____it.
In1991，whilet11eeconomiesofindustrializedcountriesmetaneconomic_____，theeconomiesofdevelopingcountriesweregrowingveryfast．
Itisestimatedthat，currently,about50，000speciesbecome_____everyyear．
Inordertolivethekindoflifewewantandtobethepersonwewanttobe，wehavetodomorethanjust________withevents．
