Only in this way_______progress in your subjects.
Helen always helps her mother even though going to school ______ most of her day.
We regret to inform you that there are no tickets ______ for Friday's performance.
Mr.Wang ______ two boys to send the sick boy to the nearest hospital.
My teacher's rich knowledge of science ______ my decision ______ study science.
There is reason to believe that most writers have difficulty in ______ the opening paragraphs of their papers.