Put the verbs in brackets into the past simple, past

Put the verbs in brackets into the past simple, past continuous, past perfect or past perfect continuous.
21
Peter...........................................................(talk) on the phone when I went to his office, so I didn't want to interrupt him.
22
We didn't see Jane at the party, because
when we got there she......................................................................(already/go) home
23
When....................................................... (James/graduate) from university?
24
John............................................................ (try) to fix his computer for two hours before he decided to call a professional.
25
Sam............................................................. (not/win) the Young Inventor of the Year Award last year, but he's sure he will this year.