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
-----Now, where is my ticket ?
-----______. We will be late for the film.
A．Take it easy B．Come on C．Don’t worry D．Take your time
