Activities in the past

I _______ my arm yesterday. I _________ on the ice while I ________ the street in front of the library. *

a) breaking - were slipping - crossing
b) was breaking - was slipping - was crossing
c) were breaking - slipping - crossed
d) broke - slipped - was crossing

I _______ Pedro at nine last night, but he _________ at home. He ________ at the library. *

a) called - wasn't - was studying
b) was calling - weren't - were studying
c) were calling - didn't be - studied
d) calling - wasn't being - studying

I got a package in the mail. When I _______ it, I _________ a surprise. *

a) opening -finding
b) was opening - was finding
c) were opening - were finding
d) opened - found