choose the correct alternative
1. I bought a house who/ which / that / whose has three bedrooms.
2. Mr Schulz, who / which / that / whose is my English teacher, plays tennis.
3. The teacher who / which / that/ whose helped me was ms Vermon.
4. This is the book who / which / that / whose I have read.
5. This book, who / which / whose is John's, has over 300 pages.
6. Dave, who / which/ whose sister I have dated, has moved to London.