---Who’s the man talking to our teacher?
---A professor_____a visit to our school.
| A．pays | B．to pay | C．paid | D．paying |
There was a long queue for coffee. Having waited for 10 minutes, we ____ gave up.
| A．absolutely | B．actually | C．eventually | D．occasionally |
So difficult did I find ___ to work out the problem that I decided to ask my partner for help.
| A．myself | B．us | C．it | D．that |
John went to the hospital alone. If he me about it, I would have gone with him.
| A．tells | B．told | C．should tell | D．had told |
____ of time and energy have been spent in making the earthquake-stricken areas a permanent museum to remind people how disastrous a natural disaster can be.
| A．A great deal | B．A good many | C．Large numbers | D．Large quantities |
___ we know some basic knowledge concerning AIDS, we can protect ourselves from being infected.
| A．If only | B．Even if | C．So long as | D．Unless |