A. Fill in the gap with: WHO, WHOM, WHICH, or WHOSE. 1. Mark Twain is an author ____________ books I like best. 2. Where is the house in ____________they are living? 3. Her father ____________she looked after over twenty years died last year. 4. I’ll give you the address ____________you could write to. 5. The students ____________names are printed on the board pass the final exam. 6. The man ____________I sat next to on the train smoked all the time. 7.The girl ____________showed me the way to your house has a beautiful oval face. 9. The book ____________I received on my birthday is informative. 10. Don is a friend with ____________ I stayed in Australia.