7.
I felt that I... (to meet) the man somewhere before.
a) had meet
6) had met
8. He asked me why (to leave) the party so early.
a) had left
6) had leave
9.
He wanted to know what ... (to happen) to his briefcase.
a) had happened
6) had happen
10. Previously he ... (to be) a very good student.
a) had were
6) had been​