Use the verbs in parenthesis, to write the correct Past Simple or the Past Perfect tense?

Use the verbs in parenthesis, to write the correct Past Simple or the Past Perfect tense. 1. When their mom _______________ (come) home last night, the children _______________ (eat) their dinner. 2. Yesterday I _______________ (see) a woman who _______________ (be) at school with my grandfather. Isn't it strange? 3. It started to rain and I _______________ (remember) that I _______________ (forget) to close my bedroom window. 4. I _______________ (find) a book that I ______ never _______________ (read). 5. We _______________ (try) to change the plane tickets but it was too late they ______ already ___________ (edit) the boarding pass. 6. I _______________ (think) I _______________ (meet) this girl before.