61、 I could not afford to rent a house like that,_________ it.
A．let alone to buy
B．let alone buy
C．to say nothing to buy
D．say nothing buying


62、
Words_________ meaning, as we all know.
A．convince
B．convey
C．contribute
D．conquer


63、 With a school record like yours, ________why you didn' t try for a university scholarship.
A．I' m shocked
B．I' m puzzled
C．I' m amazed
D．I feel pity


64、 We tried to ________the nervous old lady that flying was safe.
A．secure
B．ensure
C．assure
D．certify


65、 He has arrived late_________
A．as usual
B．as usually
C．like usual
D．like usually


66、 I can' t tell the_________ difference between the twin sisters.
A．slight
B．simple
C．slender
D．single


67、 The search was_________when the fog got thicker.
A．called off
B．called on
C．called in
D．called for


68、 It would be a mistake to________ this law to situations which are outside this range.
A．apply
B．employ
C．use
D．fit


69、 A judge must be_________ when weighing evidence.
A．interested
B．disinterested
C．separated
D．disconnected


70、 Tony is very disappointed_________ the results of the exam.
A．for
B．toward
C．on
D．with