Don’t be angry with the little boy! He broke the window ________.
| A．on purpose | B．at once | C．in surprise | D．by accident |
—Shall I inform him of the change of the schedule right now?
—I am afraid you ________， in case he comes late for the meeting.
| A．will | B．must |
| C．may | D．can |
I ________ use a clock to wake me up because at six o'clock each morning the train comes by my house.
| A．couldn't | B．mustn't |
| C．shouldn't | D．needn't |
What do you mean, there are only ten tickets？There________be twelve.
| A．should | B．would |
| C．will | D．shall |
—________ I take the book out?
—I'm afraid not.
| A．Will | B．May |
| C．Must | D．Need |
Doctors say that exercise is important for health, but it ________ be regular exercise.
| A．can | B．will |
| C．must | D．may |