51．
A．not
B．little
C．no
D．none
52．
A．work
B．operate
C．carry on
D．open
53．
A．study
B．1earn
C．attend
D．are educated
54．
A．of
B．at
C．on
D．about
S5．
A．to
B．in
C．on
D．by
56．
A．another
B．else
C．other
D．others
57．
A．of
B．in
C．for
D．on
58．
A．for
B．to
C．with
D．by
59．
A．for
B．by
C．with
D．on
60．
A．moreover
B．however
C．besides
D．consequently
61．
A．arrive
B．hold
C．take
D．reach
62．
A．approve
B．oppose
C．praise
D．object
63．
A．And
B．Besides
C．Again
D．But
64．
A．As example
B．As an example
C．For example
D．For an example
65．
A．for
B，with
C．to
D．on