It took a long time for the effective use of natural gas ______.

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• 1To some people, happiness is __________ by family and friends, while to others, it means ___________ success.

  A.being surrounded ; achieving

  B.being surrounded ; to achieve

  C.to surround ; achieving

  D.surrounding ; to achieve

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• 2________ with so much trouble, we failed to complete the task on time.

  A.Faced

  B.Face

  C.Facing

  D.To face

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• 3Go to bed right away．Don't forget you need to get up as early as you can ______ the early train．

  A.catch

  B.catching

  C.caught

  D.to catch

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• 4______ where to go, he asked a passer-by for help.

  A.Having lost his way and didn't know　

  B.Losing his way and didn't know

  C.Having lost his way and not knowing　

  D.Lost his way and didn't know

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• 5John rushed out in a hurry, ____ the door ____.

  A.leaving ; unlocking

  B.left; unlocked

  C.leaving; unlocked

  D.left; unlocking

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• 6_____ in her best skirt, the girl tried to make herself _______ at the party.

  A.Dressed; noticed

  B.Dressing; noticing

  C.Dressing; noticed

  D.Dressed; noticing

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• 7He looks forwards every afternoon to _____ the flower-lined garden.

  A.visit

  B.paying a visit

  C.walk in

  D.walking in

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• 8School kids take part in parades on campus on Halloween, __________ in colorful costumes, after which there is a small party inside the classroom.

  A.dressing

  B.dressed

  C.being dressed

  D.dress

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• 9I'd like to have this rope _______ that wire.

  A.joined in

  B.joined to

  C.join in

  D.join to

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• 10I remembered _____ the door before I left the office, but forgot to turn off the lights.

  A.locking

  B.to lock

  C.having locked

  D.to have locked

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