________the birthrate down by 10%,the number of the population has decreased.
| A．For | B．With | C．As | D．By |
It is said that there are plenty of hotels in that town. There _____ be any difficulty for you to find somewhere to stay.
| A．wouldn’t | B．mustn’t | C．shouldn’t | D．needn’t |
When Marx was in London, he _____ read at the library for hours.
| A．would | B．might | C．could | D．should |
Keep up good state of mind even if you _____ fail plenty of times.
| A．must | B．will | C．can | D．should |
— Are you coming to Jeff’s party?
— I’m not sure. I _____ go to the concert instead.
| A．must | B．would | C．should | D．might |
— Mary’s got mad and has been sent to the mental hospital. Did you tell her boss about that?
— Yes, but I _____ her husband first.
| A．should have told | B．shouldn’t have told | C．must have told | D．needn’t have told |