1. That's the boy __WHOSE___ father is a pilot.
2. Cate Blanchett, __WHO__ stars in "The Lord od the Rings", is a great actress.
3. The book __WHICH__ you borrowed is mine.
4. 31st October, __WHEN__ Halloween takes place, is my favourite day.
5. Minsk, __WHERE__ my brother was born, is the capital of Belarus.