Заполните пропуски глаголом to see в соответствующем времени. I ... a friend in the library yesterday. I ... him there many times before, but he was so busy that I did not speak to him. When I spoke to him he said that he ... never ... me at the library. He concentrates on his work. He ... only his book. The teacher ... him there many times, but he doesn’t ... even her. He ... many important facts in books, however, and tells the class about them. He ... and read more important documents than all the rest of our class put together.

1) saw
2) had seen
3) had never seen
4) sees
5) has seen, see
6) sees
7) sees