—It is a mystery and a shock to all who knew him that he____ have taken his own life in this way.—What a pity, indeed.
—Shall I inform him of the change of the schedule right now?—I am afraid you ________, in case he comes late for the meeting.
I ________ use a clock to wake me up because at six o'clock each morning the train comes by my house.
What do you mean, there are only ten tickets?There________be twelve.
—________ I take the book out?—I'm afraid not.
Doctors say that exercise is important for health, but it ________ be regular exercise.