51、 The_________ goal of the book is to help bridge the gap between research and teaching, partic-ularly the gap between researchers and teachers.
A．joint
B．intensive
C．overall
D．decisive


52、One must try his best to _________ to the new environment.
A．adopt
B．adapt
C．adept
D．apt


53、 A completely new situation is likely to________ when the school leaving age is raised to 16.
A．arouse
B．rise
C．arise
D．abide


54、 You will be late________you leave immediately.
A．unless
B．until
C．if
D．or


55、 Because the company was doing more business, it was necessary to_________ the factory.
A．extend
B．increase
C．rise
D．lookers


56、 Wood does not conduct electricity, _________.
A．nor rubber does
B．nor does rubber
C．also doesn' t rubber
D．so doesn' t rubber


57、 At first the institute refused to purchase the telescope, but this decision was_________revised.
A．occasionally
B．consequently
C．successively
D．subsequently


58、 The fiat where we live_________three rooms only.
A．is comprised of
B．is made of
C．contain
D．is composed of


59、 If you don' t go, I shall not______
A．either
B．too
C．also
D．yet


60、 It was not until the accident happened________
A．when I became aware of my foolishness
B．when my foolishness became obvious
C．that did I realize my foolishness
D．that I became aware of my foolishness