61、 The cost of the air fare is higher than________
A．the rail fare
B．that of the rail fare
C．those of the rail fare
D．which of the rail fare

62、 It has always been the________ of our firm to encourage workers to take part in social activities.
A．plan
B．campaign
C．procedure
D．policy


63、 He will surely finish the job on time_________ he' s left to do it in his own way.
A．in that
B．so long as
C．in case
D．as far as


64、 The company is small but promising._________ , I' 11 take the job.
A．In some cases
B．In that case
C．In case
D．In any case


65、 ________a good thing they didn' t catch you.
A．That' s
B．There' s
C．It' s
D．What' s


66、 What makes the space shuttle _________is that it takes off like a rocket but lands like an airplane.
A．exceptional
B．strange
C．unique
D．rare


67、 These plastic flowers look so ________that many people think they are real.
A．beautiful
B．natural
C．artificial
D．similar


68、 After being tested in many ways, this newly-designed machine will_________in the near future.
A．take place
B．put into use
C．come into use
D．take action


69、 Experienced teachers make______ mistakes than beginners．
A．lesser
B．fewer
C．not many
D．very few


70、 He never let me when ________I need his support.
A．in
B．down
C．off
D．out