Me ayudan a contestarPut the Past Simple or the Past Perfect?

Me ayudan a contestar Put the Past Simple or the Past Perfect. 1. When their mum _______________ (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 _______________ (met) this girl before.