He found that complex problems, especially those _____ abstract thinking, were best for picking out bright and dull students.
| A．involve | B．involved | C．involving | D．being involved |
— Are you still going to Shanghai for the Spring Festival?
— Yes, but I really _____ because I have a lot of things to deal with.
| A．can’t | B．mustn’t | C．won’t | D．shouldn’t |
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 |