Вопрос по английскому языку:

Вставьте местоимения who, whose,which
He didn’t know ___ sheet of paper it was. 2. We are talking about the book ___ we bought yesterday. 3. I don’t know the man ___ is looking at me. 4. Where is the pizza ___ she cooked yesterday? 5. Do you know ___ cat it is? 6. I know ___ broke your smartphone. 7. We are discussing the boy ___ won the competition. 8. Do you see the elephant ___ has a big red bow? 9. He wonders ___ house it is. 10. The apple-pie ___ I bought is in the fridge.