----_______ do you brush your teeth?----- Twice a day.A .How much B. How often C. How long
---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.
---Never touch my computer while I’m away. ---Sorry, __________.