Условие задания:

Complete the sentences with the correct forms of the verbs in the brackets. Use the past perfect continuous.
1.  Laura needed a break because she (study)  all morning.
2.  You got sick because you (eat)  all the time.
3.  The passengers (wait)  for four hours before the ground staff could finally give them information on the delay of their flight.
4.  Around six o´clock he (take)  the dog for a walk.

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