This printer is of good quality. If it _______ break down within the first year, we would repair it at our expense.
| A．would | B．should | C．could | D．might |
“ _____ you play baseball?” “ No, I _______. “
| A．Can; may | B．Can’t; can’t | C．May; can’t | D．can; can |
You_____seeher,butImust.
| A．haven’t | B．cannot | C．mustn’t | D．needn’t |
Thebushadleft,sowe_____walkhome.
| A．haveto | B．ought | C．hadto | D．must |
Thedoorisstillclosed.He_____thekey.
| A．musthavelost | B．mustlose | C．needhavelost | D．canlost |
Mary_____beinLondonbecauseIsawherintownjustnow.
| A．mustn’t | B．isn’tableto | C．maynot | D．cannot |