Jawaban:

1) i was sitting in a cafe when you called me
2) when you arrived at the party who was there?
3) suzy was watching a film when she heard a noise
4) yesterday i went to the library, next i had a swim, later i met julie for a coffee
5) we were playing tennis when john injured his ankle
6) what did they do at 10pm last night? it was so noisy!
7) he was taking a shower when the phone rang
8) he was in the shower when the phone rang
9) when i walked into the room, everyone was working
10) its was a day last september. the sun was shining and the birds were singing. i was waliking along the street when i met an old friend

Penjelasan:
sorry if part 1 "it was a day last september" salah because i am not very sure about that part you're welcome