Английский. Какие слова нужно вставить в предложение

1) Aithough the sun was shining, it was still cold, because it ...hard for two hours

варианты:
had rained
had been raining
was raining

2) We were extremely tired at the end of the journey. We ...for more than 24 hours

варианты:
have travelled
were travelling
had been travelling

3) She ...at the parcel long enough, before she ...that it was for her brother

варианты:
was looking. understood
yad been looking. understood
had deen looking. had understood