42.Salaries for ________positions seem to be higher than for permanent ones.
A.legal
B.optional
C.voluntary
D.temporary
43.Most people agree that the present role of women has already affected U.S.society.______it has affected the traditional role of men.
A.Above all
B.In all
C.At most
D.At last
44.Science and technology have __________in important ways to the improvement of agricultural production.
A.attached
B.assisted
C.contributed
D.witnessed
45.As an actor he could communicate a whole __________of emotions.
A.frame
B.range
C.number
D.scale
46.This is what you should bear in mind: Don't __________a salary increase before you actually get it.
A.hang on
B.draw on
C.wait on
D.count on
47.The ship's generator broke down, and the pumps had to be operated __________instead of mechanically.
A.artificially
B.automatically
C.manually
D.synthetically
48.The little girl was so frightened that she just wouldn't __________her grip on my arm.
A.loosen
B.remove
C.relieve
D.dismiss
49.He never arrives on time and my ______is that he feels the meetings are useless.
A.preference
B.conference
C.inference
D.reference
50.Mrs.Smith was so ______ about everything that no servants could please her.
A.specific
B.special
C.precise
D.particular