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Half of the work ______ by now.

  A. has finished              B. has been finished       C. have been finished

More and more dangerous work _____________ by robots in ten years.
A is finished        B was finished
C will be finished    D has been finished

---Mum, can I go to the zoo with Linda?

---When your homework _______, you can.

A. is finished                      B. was finished                 C. finishes                          D. finished