As a matter of fact , this sofa is now an antique which served ______ a bed in the past .
| A．as | B．for | C．to | D．with |
Great efforts to increase agricultural production must be made if food shortage _____ avoided.
| A．is to be | B．can be | C．has been | D．will be |
-----Did you have a hard time traveling back home?
-----Yes, it ______ for four days when I arrived in Guiyang and all the roads______ covered with ice.
| A．snowed, were | B．was snowing, had been |
| C．had been snowing, had been | D．had snowed, were |
The science of computer, _______rapid progress has been made in recent years, is the most important of all science.
| A．which | B．with which | C．in which | D．to which |
-----Can you come for dinner on Sunday or Saturday?
-----I’m afraid _______ day is possible.
| A．either | B．neither | C．some | D．any |
It is not just the size of the Olympic Games ___makes them unique, but ____they mean to us .
| A．which, that | B．that, what | C．that, because | D．that, that |