“Stop thief! Stop thief!” But the thief was ________ by the crowd and we lost sight of it.
| A．drowned | B．swallowed | C．caught | D．stopped |
As is natural, a man as old as he ______ be very forgetful.
| A．can | B．must | C．should | D．would |
You _____ pay too much attention to your reading skill, as it is so important.
| A．cannot | B．should | C．must | D．needn’t |
I _____ have written to him because he phoned me shortly afterwards.
| A．ought to | B．must | C．couldn’t | D．needn’t |
Sir, you ______ be sitting in this waiting room. It is for women and children only.
| A．oughtn’t to | B．can’t | C．won’t | D．needn’t |
He hurt his leg climbing the mountain; otherwise, he _____ the meeting.
| A．will attend | B．had attended | C．would have attended | D．would attend |