—Must we keep the window open all the time? A. No, you mustn’t B. No, you can’t. C. No, you don’t have to.
Let’s go to Nanchan Temple,__________?
——How long have you worked here? ——__________________.
Peter ________ to help our math teacher carry books yesterday.
——What’s your mother? ——She_________ a teacher, but now she is a doctor.
——How long has his father ________London? ——For two weeks.