4. Before yesterday, I ... that man in our office. 5. I used my time well while I ... for my plane - I wrote some emails. 6. By the time he returned, I ... my work on the report.
4.а)didn't see b)was not seeing c)had not seen
5.a)waited b)was waiting c)has waited
6.a)finished b)was finishing c)has finished ​
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