Every possible means ________ to prevent the air pollution，but the sky is still not very clear.
A．were using B．have used
C．has been used D．was used
I invited Joe and Linda to dinner，but ________ of them came.
A．neither B．either C．none D．both
More and more people are willing to ________ part of their incomes to school children in the povertystricken areas.
A．give away B．give in C．give out D．give up
Although he has not gone to college，he shouldn't ________ studying for his degrees.
A．be prevented B. be stopped
C．be kept from D．be protected from
The reason ________ he was late for the meeting is ________ his car broke down on the road.
A．why; that B．why; because
C．that; that D．for which; because
________Beijing you see today is quite ________ different city from what it used to be.
A．The; / B．/; the C．The; a D．A; a
