—The river smells so terrible! How did it come about?—People used to pour dirty water into it.

—Mom, I have great trouble with my math. —Never __________ and you will learn it well.

Students can’t be made ______ all day.

Mother often tells Tom ______ too much time playing video games.

---Zhang Lin has decided to       his bad habit of smoking．---That’s good news．I hope he can do it．