present perfect vs past simple

We ........ each other since childhood.

• knew

• have known

He ....... in Rome a long time ago.

• lived

• has lived

Last night, I ......... a comedy film.

• watched

• have watched

We ........... to solve this difficult problem for two hours.

• tried

• have tried

My family have lived here ........ last month.

• for

• since

Tom has lived in the town ....... three years.

• for

• since