acertaindoubtamongthestudentsa

_________ a certain doubt among the students as to the necessity of the work.

A．It existed	B．There existed
C．They had	D．There had

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The police including an officer searching for the murderer in the area the other day.

A．was

B．are

C．were

D．is

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Alice spent much time _____ the piano each day.

A．to practice playing	B．practicing playing
C．to practice to play	D．practicing to play

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--- You are always full of _____. Can you tell me the secret?
--- Taking plenty of exercise every day.

A．force

B．energy

C．strength

D．power

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Tom thinks _____ important to get to know his students well.

A．that

B．it

C．this

D．him

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_____ is known to us all _____ Lu Xun is famous for his great works_____ a great writer.

A．It; that; for	B．It; that; as
C．As; / ; for	D．As; that; as

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