Раскройте скобки, употребляя глаголы в Past simple или Past Perfect

1)When I (to come) home, mother already (to cook) dinner. 2)When father (to return) from work, we already (to do) our homework. 3) When the teacher (to enter) the classroom, the pupils already (to open) their books. 4)Kate (to give) me the book which she (to buy|) the day before. 5) Nick (to show) the teacher the picture which he (to draw). 6) The boy (to give) the goats the grass which he (to bring) from the field.