—How about your travel?
—You can hardly imagine what difficulty we have had ______ the vast desert.
| A．explored | B．exploring | C．to explore | D．explore |
It is much easier to talk about social change than to .
| A．bring it on | B．bring it about | C．bring it up | D．bring it out |
It’s 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 |
This is a story completely by him, so don’t rust him.
| A．discovered | B．invented | C．found | D．known |
If we can’t afford meat we shall have to with fish.
| A．do | B．go | C．eat | D．deal |
Historical experience can as a most important source of information.
| A．serve | B．use | C．regard | D．prove |