She suffered a mental disease for quite some time and in the end she _____ go into a mental hospital.
A. had to B. must C. would like to D. could
— Finally I got to my grandmother’s home on foot.
— Really? You _______ a ride there.
A. must have taken B. could have taken
C. shouldn’t have taken D. couldn’t have taken
Since you have come so far with your experiment，you carry it through to the end.
A. may B. might C. may well D. may as well
– Lucy doesn’t mind lending you her dictionary.
-- She ______ . I've already borrowed one.
A. can't B. mustn't C. needn't D. shouldn't
Jack’s ill, so they ______ change their plans.
A. must B. should C. have got to D. ought to
Excuse me, six, Mr. White has arrived. he wait outside or just come in ?
A. Shall B. May C. Could D. Must
