The dead rate is _____ pigs and recovery usually ______ within 7-10 days.
A low in; occurs B.rich in;happens
C.high in; came about D.poor in;took place
Helen _________ go on the trip with us, but she isn’t quite sure yet.
| A．shall | B．must | C．may | D．can |
Mr. White _______ at 8:30 for the meeting, but he didn’t show up.
| A．should have arrived | B．should arrive |
| C．should have had arrived | D．should be arriving |
— Mum, I’ve been studying English since 8 o’clock. _______ I go out and play with tom for a while ?
— No, I’m afraid not. Besides, it’s raining outside now.
| A．Can’t | B．Wouldn’t | C．May not | D．Won’t |
— Excuse me, Is this the right way to the Summer Palace ?
— Sorry, I am not sure, but it _______ be.
| A．might | B．will | C．must | D．can |
— I don’t mind telling you what I know.
— You _____. I’m not asking you for it.
| A．mustn’t | B．may not | C．can’t | D．needn’t |