Is _________ 48 hours _________ the man-made satellite _________ is made in our country to orbit the planet around?

 A. it; that; where           B. it; when; that  C. it for; that it takes; that   D. it; that it takes; which

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See? The strange man I saw yesterday _____ around my house again. Should I call the police？


  1. A.
    walk
  2. B.
    walked
  3. C.
    is walking
  4. D.
    has walked

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