The number of the students in senior high school, ____ is mentioned above, is increasing.
| A．as | B．which | C．what | D．who |
—The poor people lived near the highway.—_____ very noisy.
| A．It must have been | B．They must be | C．That might be | D．There must be |
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 |