Underline the best answer to complete the following sentences.
1. It is the most interesting book ( which/that/what) i've ever red.
2. Our fixtures, ( that/where/which) we visited last week, are very expensive.
3. Ho Chi Minh City (when/which/where) we visited last year, is the largest city in Vietnam.
4. The man over there is an artist (whose/who/whom) father can speak four languages.
5. She is the girl (who/whom/why) i bought these roses for.
6. He often tells me about his school (when/which/where) he studied.
7. This is the village, (which/where/who) we visited last month. Our Uncle Ho was born there.
8. The girls and flowers (who/which/that) he painted were vivid.
9. The house in (which/that/whose) i am living is my parents'.
10. Trong Tan, (whom/who/that) sang a song on TV last night, is a famous singer.