Weare_______attherapidprogressMarkhasmadeinthissemester.
A、distinguishedThisriverissobigthatitisimpossibletobuilda_______underitwithoutmoderntechnology.
The_______workcontinuedformorethanaweekbuttherewasstillnosignofthemissingboy.
Manykindsofanimalsarebelievedtohave_________fromtheearth
ProfessorSmithisalsothe_______oftheinternationalprogramoffice.Ifyouhaveanyproblemwhenyoustudyhere,youmaygotohimforhelp.
Bothsugarandsaltcan______inwater.
