In the past 50 years, there _____ a great increase in the amount of research ____

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1We’ll have to take the machine apart to put it right.

A had leaked
B leaked
C is leaking
D has been leaking

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2When Sally _____ the criminal _____ her house, she screamed at the top of her voice because she didn

A saw;enter;killed
B saw;enter;to be killed
C sees;entering;be killed
D sees;enter;killing

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3I hope you will give me some extra time.

A am to have finished
B was to finish
C was to have finished
D ought to finish

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4The growth of two-income families in the United States _____ of people moving to a new social class.

A has resulted in millions
B results of millions
C millions of results
D resulting in millions

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5If it _____ a nice day, we _____ for a picnic.

A had been; would have gone
B was, would go
C were; would have gone
D would be; would go

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6The board _____ of the opinion that the news shouldn’t be carried in the newspaper.

A is
B will be
C were
D are

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7The captain and his crews depended on the( )of navigation- the compass for orientation.

A instrument
B device
C appliance
D equipment

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8The panel has not yet reached agreement on a crucial question，however，( )to recommend legislation that

A whether
B if
C that
D how

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9The( )at the military academy is so rigid that some people cannot endure it.

A convention
B confinement
C principle
D discipline

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10My son failed to come back last night.This morming the police came to our house and( )my worst fears

A advocated
B confirmed
C promised
D insured

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In the past 50 years, there _ a great increase in the amount of research _ on the human brain.

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In the past 50 years, there _____ a great increase in the amount of research _____ on the human brain.

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In the past 50 years, there _ a great increase in the amount of research _ on the human brain.