Evenifhisletter____tomorrow，it____toolatetodoanything.
Thismissileisdesignedsothatonce_____nothingcanbedonetoretrieveit.
Evenifhisletter（）tomorrow，it（）toolatetodoanything.
____Thewaterleftinthekettle,thedoctorputseveralthingsheunwrappedfromahandkerchief.
Thecompositionscontainedsofewerrorsthattheteachergotthestudents_____oneanother’spapers.
