Present perfect или pas simple 1) i (know) her for sex years. 2) he ( in paris from 20 years ago. 3) where's pete? i (not see) ..him for ages. 4) we (be) primary school from 1993 to 1977. 6) his (come back) to london last sunday. 7) (just/buy) some postcards.

1) I've known her for sex years. 
2) He lived in Paris 20 years ago. (предположила, что в оригинале опечатка)
3) Where's Pete? I haven't seen him for ages.
4) We were at primary school from 1993 to 1977.
6) His father came back to London last Sunday. 
7) They've just bought some postcards.