The book is neither yours nor mine. Whose ________ it be?
Here are all the books I have.You may borrow _______ you like.
Father made a promise _______ I passed the examination he would buy me a bicycle.
If you feel tired and sick of fat food, that is _______ you have to go to the hospital for a medical examination.
After Yang Liwei succeeded in circling the earth, _______ our astronauts desire to do is walk in space.
A modern city has been set up in _______ was a wasteland ten years ago.