Помогите.Put the verbs in brackets into the correct past tense.Gemma,listen to

Помогите.
Put the verbs in brackets into the correct past tense.
Gemma,listen to this!I was walking through the city center yeaterday when I .... (notice) that a crowd ... (gather) around two men. Apparently,they .... argue loudly for more than half an hour!
.......(they/resolve) their argument?
I (not/hear) from Sam in Australia until yesterday when i got his latter.
As I (open) the envelope,he ...... (phone) me!He said he ..... (have) trouble with his computer but he .... (fix) the problem.