2 . We have to give up the project, for all the four proposals are sensible in theory but________of them work in practice.

A．all

B．each

C．neither

D．none

3 . If we don’t take action to conserve the earth, natural resources will be steadily consumed until finally         is left.

A．none

B．nothing

C．no one

D．no

4 . The train doesn’t stop at ______station along the way, but it stops at ______of the main ones.

A．all; either

B．every: most

C．few; all

D．each; none

6 . He doesn’t want ________ part of that report to be made public before he has a chance to look at it.

A．some

B．any

C．all

D．none