--- I haven’t got the reference book yet, but I’ll have a test on the subject next month. --- Don’t worry. You _______ have it by Friday.

— I regret to say that I          have shouted at you the other day．— Forget it． I was a bit out of control myself．  

---Mr. Wu, can I have a look at the scores?---Well, you are a senior, so I_____ hardly remind you that the scores are not open to students.

When the traffic lights are red, we _______ stop.

---Look at the boy running on the playground. Is it David? ---It ______ be him. I saw him go to the teachers’ office just now.