I took mathematics and physics because I think that _______very important for me

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I took mathematics and physics because I think that _______very important for me to make further
research in this field.   [     ]
A. that is
B. they are
C. this
D. which are

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举一反三

______ is ______. The wrong answer is ______.  [     ]
A. Two minutes, a long vacation for the students
B. One and a half dollars(yards), not enough
C. The New York Times, published daily
D. 800 miles, long distance

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The teacher, with 6 girls and 8 boys of her class, _____ visiting a museum when the earthquake struck.[     ]
A. was
B. were
C. had been
D. would be

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No one in the department but Tom and I ____ that the director is going to resign.[     ]
A. knows
B. know
C. have known
D. am to know

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A library with five thousand books ____ to the nation as a gift. [     ]
A. is offered
B. had offered
C. are offered
D. have offered

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Books of this kind ____ well.[     ]
A. sell
B. sells
C. are sold
D. is sold

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