Помогите!
Употребите глаголы, данные в скобках, в Past Perfect.


1) I was sure that I (see) the man before.
2) I asked him why he (leave) the party so early.
3) It was clear that he (give) us the wrong address.
4) The teacher corrected the exercises which I (prepare).
5) He knew that he (make) a serious mistake.
6) She said she (look) everywhere for the book.
7) I felt that I (meet) the man somewhere before.
8) He wanted to know what (happen) to his briefcase.