The question is very important. It really needs _______.
| A．carefully discussing | B．carefully to discuss |
| C．to carefully be discussed | D．being discussed carefully |
The haze or smog was so serious that the winter running _________.Some students complained as they ran
| A．could have cancelled | B．should have cancelled |
| C．must have been cancelled | D．ought to have been cancelled |
—What about __________ lecture yesterday?
—Well，__________ most boring one indeed.
| A．／；the | B．the；a | C．the; the | D．／；a |
The doctor must be _______ 24 hours a day, 7 days a week in the boarding school.
| A．on call | B．by hand | C．in sight | D．on spot |
What was considered impolite years ago has become ________now.
| A．accessible | B．adjustable | C．unbelievable | D．acceptable |
Which way do you enjoy _______ the coming winter holiday, staying home or going on a trip to Europe?
| A．spending | B．spend | C．to spend | D．to be spending |