Polar explorers have to be extremely______ to bear the climate and other hardships.
| A．tough | B．rough | C．difficult | D．brave |
Information has been put forward ________ more middle school graduates will be admitted into universities.
| A．while | B．that |
| C．when | D．as |
________ she couldn't understand was ________ fewer and fewer students showed interest in her lessons.
| A．What ; why | B．That ; what |
| C．What ; because | D．Why; that |
It's nearly time for the meeting to start. The manager ________ be here soon.
| A．could | B．should |
| C．need | D．would |
--Is Professer Smith giving the speech today?
--It ________ be him. He is abroad right now.
| A．mustn't | B．needn't |
| C．won't | D．can't |
A left-luggage office is a place where bags ________ be left for a short time, especially at a railway station.
| A．should | B．can |
| C．must | D．will |