Пожалуйста добрые люди помогите пожалуйста, поставте глаголы из скобок в форму Past Continuous.

1) When it started to rain, they were sitting on the grass.2) Which hotel was Anna staying when she lost her credit card?3) We were sleeping when the phone rang.4) Doctore Fleming discovered pencillin while he was studying influenza.5) Sam was standing under the tree because it was raining.