Раскройте скобки употребляя глаголы в Past Simple или Past Perfect1

Раскройте скобки употребляя глаголы в Past Simple или Past Perfect1.When I (to come) home,mother already (to cook) dinner.2.When the teacher (to enter) the classroom,the pupils already (to open) their books.3.Kate (to give) me the book which she (to buy) the day before. 4.Nick (to show) the teacher the picture which he (to draw).5.The teacher (to understand) that Lena (not to do) her home work.