If you keep ______ ,you’ll be a very good swimmer one day.

---Could you tell me when Mr. Li _______ in Changchun? ---Sure. When he _______, I’ll call you.

I ________ a student and Miss Liu ________ my teacher. 

--- Mike is really a polite boy.--- Yes. He ________ “Good morning” to me every day.

—How long have you _____the novel?—Three days.