He must have attended the meeting yesterday,___________  he?

Sir, you ______ be sitting in this waiting room. It is for women and children only.

Among the 15-year-old children, some        studying in university while others are still learning to read and write.

Were it not for the debt, we ______a happy life:

---“Why do you have to be there at six?”---“The teacher demands that everyone _____in his seat at six.”