A new power plant built causing concern of the environmentalists. The system fully tested by tomorrow morning. The tigress was still looking for her cubs a week after they . This chess championship of the "giants" watched very closely. You warned! The book was not published until every small detail checked. The car invented right before the XX century. The Olympic stadium will constructed using modern technologies. The police found that the wax seal on the jeweller's box broken. This book written in English. This human error could avoided.
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Задание

Choose the correct option

  1. [Is the seat taken?|Has the seat taken?]
  2. A new power plant
    [has|is being] built causing concern of the environmentalists.
  3. The system
    [will be|will have been] fully tested by tomorrow morning.
  4. The tigress was still looking for her cubs a week after they
    [had been disappeared|had disappeared].
  5. This chess championship of the "giants"
    [is being|has] watched very closely.
  6. You
    [are being|have been] warned!
  7. The book was not published until every small detail
    [had been|was] checked.
  8. The car
    [was|had been] invented right before the XX century.
  9. The Olympic stadium will
    [be|have been] constructed using modern technologies.
  10. The police found that the wax seal on the jeweller's box
    [was|had been] broken.
  11. This book
    [was|has been] written in English.
  12. This human error could
    [be|have been] avoided.

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