Complete the sentences with which or who.
1) This is Sandra, ______ is studying art.
2) He calls her 'sweetiepie', ______ I can't stand.
3) My sister, ___ lives in London, is a lawyer.
4) Oh, look. It`s that strange man ___ came into the shop yesterday.
5) They gave me a brown jumper, ___ is absolutely hideous.
6) She came to my party, _____ was rude, because she wasn't invited.