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    On account of his knowledge of the mountainous country, John Smith was appointed as our ________.


    1. A.
      teacher
    2. B.
      guide
    3. C.
      leader
    4. D.
      commander

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    On account of fuel supplies being finite and many people being wasteful, we will have to install ________ solar heating device in our home.

    A. some type of a B. some types of a          C. some type of                   D. some types of

     

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    On account of fuel supplies being finite and many people being wasteful, we will have to install ________ solar heating device in our home


    1. A.
      some type of a
    2. B.
      some types of a
    3. C.
      some type of
    4. D.
      some types of

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    On account of the development of the  economy, the environment is seriously polluted and we must
    ________ the emission of the carbon dioxide.
    [      ]
    A. cut in      
    B. cut off
    C. cut up  
    D. cut down

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    On account of the development of the  economy, the environment is seriously polluted and we
    must ________ the emission of the carbon dioxide.
    [     ]
    A. cut in      
    B. cut off
    C. cut up  
    D. cut down

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