1.who 2.that 3.whose 4.where 5.which В предложениях 2 и 5 можно выпустить слова which, that. 1.I use an old computer which belonged to my brother. 2.My chemistry teacher, who is from Iceland, speaks excellent English. 3.This is my friend whose father is an austronaut. 4.This is the house where Albert Einstein lived.
