As is natural, a man as old as he ____ be very forgetful.
A.can | B.should | C.would | D.must |
My parents will not ______ my birthday party if I don't do well in my next test.
A.agree with | B.allow for |
C.approve of | D.object to |
He ______ have sent the e-mail at an earlier time, but there was something wrong with the network.
A.must | B.should |
C.could | D.might |
—Can Professor Li be in the laboratory?
—He ______ be; I saw him there half an hour ago.
A.can | B.must |
C.might | D.need |
My newly-purchased magazine is nowhere to be found. ______ I have left it on the train?
A.Could | B.Should |
C.Must | D.Would |
—Did your mother sleep well last night?
—She ______ have slept through all those noises.
A.mustn't | B.may not |
C.can't | D.won't |