—Do you think a radio is useful in learning English? —Sure. A radio can _____ listening English songs and reports.
---How do your parents usually go to work?---My mother usually goes to work _________ bus while my father ________ a bike to work.
---I want to buy the book Harry Potter. Do you know its _______? --- Not very well. Maybe fifty yuan.
---Would you mind moving the desk? --- _________. I will do it right away.
--- I hear a very big earthquake happened in Japan. Many people were injured or killed. ---___________________________.
---How long have you known the doctor ? ---_________he helped me three years ago.