Many kinds of animals are believed to have _________from the earth
B
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ProfessorSmithisalsothe_______oftheinternationalprogramoffice.Ifyouhaveanyproblemwhenyoustudyhere,youmaygotohimforhelp.
Thisriverissobigthatitisimpossibletobuilda_______underitwithoutmoderntechnology.
Without a proper education, people could _______ all kinds of crimes.
Sometimes it is very difficult to _______ some of the English words. Even the native speaker can not help.