Completing the sentences with the correct grammatical options is as follows:
1. I saw you when you a. were talking to Professor Brick.
2. Kate was very pleased to see Nora again after such a long time. She a.
hadn't seen her school friend for five years.
3. The students of our department a. have spent a lot of time in the reading room.
4. When he a. was writing that letter to his colleague he suddenly remembered that he didn’t know the exact address.
5. I b. won’t finish the report by Monday and it’s needed for Monday morning.
6. Good luck with the exam. We c. are thinking of you.
Thus, the sentences have been completed with the correct grammatical options as above.
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