51、 I don' t think it is any use __________this matter any further.
A．discussing
B．to discuss
C．to discussing
D．to be discussed


52、 __________he will come or not is unknown.
A．If
B．Whether
C．That
D．What


53、 __________you say, he won't listen to you.
A．No matter where
B．No matter what
C．However
D．Whichever


54、 After a long__________ the bill was passed by the people' s congress.
A．argument
B．debate
C．dispute
D．discuss


55、 Even if they are on sale, these refrigerators are equal in price to, if not more expensive than,__________at the other store.
A．anyone
B．the others
C．that
D．the ones


56、 The story was said to have been based on the information from a reliable__________.
A．source
B．foundation
C．origin
D．basis


57、 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

58、 The notice was written in several languages__________ foreign tourists should misunderstand it.
A．so that
B．if
C．lest
D．otherwise


59、 Living in the central American desert has its problems, __________obtaining water is not the least.
A．of which
B．for what
C．as
D．whose


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

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