The teacher told us not to take the equipment out of the laboratory until ______.

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• 1The Whites are living in a house ______ more than a century ago.

  A.to be built

  B.built

  C.being built

  D.having built

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• 2The beautiful park, _____ with thick trees, is much larger than what it used to be.

  A.which surrounds

  B.surrounded

  C.surrounding

  D.having surrounded

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• 3Linda worked for the Minnesota Manufacturing and Mining Company, ____ as 3M.

  A.knowing

  B.known

  C.being known

  D.to be known

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• 4If _____ unsolved, this may lead to more serious problems.

  A.making

  B.remained

  C.left

  D.taking

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• 5When _____ help, one often says 'Thank you' or 'It's kind of you'.

  A.offering

  B.to offer

  C.to be offered

  D.offered

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• 6He sat in the classroom with his eyes _____ on the blackboard.

  A.fixed

  B.fixing

  C.were fixed

  D.were fixing

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• 7No matter how frequently ______, the works of him still attract people all over the world.

  A.performed

  B.performing

  C.to be performed

  D.being performed

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• 8The disk, digitally _____ in the studio, sounded fantastic at the party that night.

  A.recorded

  B.recording

  C.to be recorded

  D.having recorded

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• 9Ideally _____ for Broadway theatres and Firth Avenue, the AVw York Park hotel is an favourite with many guests.

  A.locating

  B.being located

  C.having been located

  D.located

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• 10He did not know it but his little puzzle had started a whole new branch of mathematics _____ “topology”.In his honor this puzzle ______ “finding the Euler path.”.

  A.calling; called

  B.called; is called

  C.is called; called

  D.calls; calling

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