I doubt _______ they can complete the bridge ahead of time.
A、whetherB
这里表示的是：来的方式，要用how.
Thetwinsaresoalikethatitsalmost___(possible)totellthemapart.
Therediscoveryofthisspeciesofbirdsisoneofthemost___(ordinary)scientificfindingsinrecentyears.
Eachstudentistogiveashort___(speak)totherestoftheclassattheendofthesemester.
Theyknewtheyhadto________actiontodealwiththeplaguebeforeitspreadtootherareas.
I_____him150dollarsandmustpayhimbacktomorrow.
