Many kinds of animals are believed to have _________from the earth
A、withdrawnB
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ProfessorSmithisalsothe_______oftheinternationalprogramoffice.Ifyouhaveanyproblemwhenyoustudyhere,youmaygotohimforhelp.
Withoutapropereducation,peoplecould_______allkindsofcrimes.
Thisriverissobigthatitisimpossibletobuilda_______underitwithoutmoderntechnology.
Ihavenotheardanythingfromhimsincehis_______.
Theengineersinthislabspentseveralweeks_______theirplansforthenewbicycle.
