—How long have Mr and Mrs Green________?—For more than thirty years.
— Here are three books on history. Which one would you like to borrow?一______. You see, I’m interested in geography these days.
— My son seldom has breakfast.— It is unhealthy habit. You must ask him to change it.
The doctor _______ on the man and _______ saved his life.
Students can’t be made ____________ all day.
You know great changes _____________ in our school in the past ten years.